User Login    
 + Register
  • Main navigation


Lost Password?

Register now!
Fast Search
Slow Search
Google Ad

[Datsun 1200 encyclopedia]

Instrument Panel Wiring

From Datsun 1200 Club

Datsun 1200 encyclopedia | Recent changes | Edit this page | Page history | Switch to MediaWiki mode

Printable version | Disclaimers | Privacy policy
Categories: Body Electrical System | Wiring

Cluster Gauge wiring is discussed here.



Also see: 
* Wiring Diagram
* Wiring Harness Instrument Panel Harness
* Cluster Gauge Removal
* Manual vs Automatic harnesses differ 
* early harnesses were changed in April 1971
* RHD vs LHD differ
* Round-gauge harness differs from Square-gauge

Meter Connector

The Instrument Panel Harness uses this connector for the instrument panel (meter cluster):
23335.jpgAlbum 23335

Be aware that while all 1200s use this connector, the wiring order differs from 1200 round-gauge harness and 1200 rectangle gauge harness:

  • a couple of the wires are connected to different pins
  • The two M.B. (Master Beam/high beam) wires may be different colors
  • Some clusters have a Brake warning lamp and the wire color varies. Other clusters have no Brake warning lamp and the wire for that pin is missing (No Connection)

Early Round Gauge Coupe, Sedan GL
23337.jpgAlbum 23337
Pin 3 1971: RY [M.B.]
Pin 3 1972: BW

Early rectangle gauge B120 truck (1971-1978)
27051.jpgAlbum 27051

Late Round Gauge 1979-1994 truck
23334.jpgAlbum 23334 23336.jpgAlbum 23336

Cluster Gauge USA
13938.jpgAlbum 13938 21616.jpgAlbum 21616

Round Gauge Cluster vs Rectangle Cluster

PROBLEM: Turn on the lights and smoke comes out.

If it smokes, it is not earthed properly. The cluster bolts to the dash metal frame. If you wish to temporarily work with it, jump a wire to the dash frame.

PROBLEM: indicator globes stay on, no IGN lights. Move right indicator, left indicator flashes. Signal to left and oil light flashes.

If you upgrade the rectangle cluster to round cluster, the wiring is different.

  1. Some pins in the circular dash connector are different. Pop the pins of the connector and re-insert in the appropriate order.
  2. Round Tachometer may be wired in series (differently from aftermarket tachometers) to the IGN circuit that's already under the dash (this is how the factory wired tachometers). Or in series with NEG side of coil if you wish to run wires from coil into cabin. Because the tachometer works by induction, it doesn't matter which side of the coil it is wired into. If your new dash has a tachometer be sure to investigate. There are two kinds of stock Datsun 1200 tachometer which look the same but are wired differently.

Dash Changes for Sedan, Ute and Station Wagon

I think it take a skinny little screwdriver, like you use for watches/sunglasses. The ones that come in the cheap set of 5 in a plastic case at most '$2 shops'. Loosen the prongs pushing a screwdriver in the wire side of the connector, while pushing with a small allen key in the other side. I'm sure there are professional tools to do the same job, but you can do it for cheap if you apply a little patience.

dattodude's original information sheet:

Main Forum discussion: POST Rectangle cluster to round cluster

  • You will need to modify one or two wires
  • Which wires depends on whether your car is a B110 rectangle car, or a B120 rectangle ute
  • Also depends on which dash you are fitting: is it a B110 round cluster or a B120 round cluster?


pin1978 AUSlate 1200620 roundSHOOEYSround USANON-USA
4 GL dash lamps LGGLGLGLGL
8 G 12V G G YRG

Late Round Gauge (1979-1994)
23334.jpgAlbum 23334 23336.jpgAlbum 23336

620 intro USA - round gauge looks exactly like the 1200 cluster
27749.jpgAlbum 27749 27748.jpgAlbum 27748


The speedometer has a light for use at night. See the lamp section.

Speed Switch

24814 speed warning buzzer
24815 buzzer relay
25039 buzzer relay
25035 speed switch amplifier (emissions usage_
68800-AM7200 or 68600-AN8500
* AUS B120 1979-1984 ?
* Datsun 1200 1973 USA
* Datsun 620 1972 USA MT
25035-B6401 $88 USD
* Datsun 620 1974 USA MT
25035-B8000 $70 USD
* Datsun 620 1975-1979 USA MT

Speed Buzzer

Starting in 1972, all JDM speedometer came with speed switch for warning of excess velocity.

POST Sunnydaze: JDM speedo cluster has a buzzer that sounds as you pass a nominal 105km/h! That was at an actual 98km/h. The noise is somewhere between cute and annoying
24814-M0215 BUZZER-speed warning ALL 1972 B110 
24814-M0215 BUZZER (from '72-2) B120
24814-N4500 BUZZER ASSY 7510-8910 ALL, OPTION 8910-
            スピード ワーニング ブザー リレー
24815-H3121 RELAY-speed warning buzzer (from '72-12) (断続ブザー用) B120
24815-G1000 RELAY-speed warning buzzer 7212-7803 B120 < 24815-H3121
24815-G1060 RELAY-BUZZER 7804- [for round gauge cluster]
速度警告音: Speed warning sound (KOKOKUKO) is a sound emitted when the speed of a vehicle or the like reaches a certain level or more.

In the Japan car when the vehicle speed is about 105km/h in the passenger car, and more than about 85km/h in the light vehicle, the alarm sound such as the mechanical chime and the buzzer was ringing for attention to the driver.
The speed warning regulation was ended in 1986, due to the dangers of sleep induction caused by repetitive warning sound.

JDM 1972 speedometer has special switch/amplifier/buzzer, to warn when speeding. The circuit board on the back of the cluster is modified:

* Center turn signal connector is moved
* Small Box is mounted in center
* Clock/tach IGN feed circuit has and additional tap

This same cluster housing appears to be used by USA Datsun 620 pickup.

18702.jpgAlbum 18702

* Yellow wire: 12V IGN
* Black wire: Goes into cluster housing

1972 GX with directly-connected speed buzzer

Sunny Truck cluster round gauge (1978-up) with speed buzzer connected to relay
28726.jpgAlbum 28726

Sunny Truck 1977 cluster square gauge with buzzer at top of cluster board and buzzer relay attached to speedometer

Ute Amplifier Speed Switch

Amplifier for B120 ute Throttle Opener Assembly (see Emission Controls).

The speed detecting switch is part of the speedometer assembly and is installed in the speedometer. The amplifier prevents damage to the speed detecting switch which actuate the throttle opener only when the car speed is above 10km/h. Pub No. SM6E-EMC0A0, Page EC-11
Matsushita 68600-AN8500
13695.jpgAlbum 13695
* Red: IGN
* Black: goes to Red wire coming out of top center
  of cluster (speed switch)
* Green: Output signal
11981.jpgAlbum 11981
wiring4.jpgPost click for topic
wiring5.jpgPost click for topic 
68800-AM7200 speed sensor
* Yellow spade: IGN feed
* Red: speed switch (speedometer)
* Green: Ouput signal

USA Amplifier Speed Switch

USA model from 0772 (1973 model year) used an amplifier speed switch.

* 25035-H7000 ASSY-AMPLIFIER SPEED SWITCH > 25035-P4502

1973 USA model B110 used an amplifier speed switch for Throttle Opener system.
23062.jpgAlbum 23062

Blue/Red wire: output signal to T.O.

USA Datsun 620

Datsun 620 pickup USA also uses the amplifier speed switch for the BCDD system

620 cluster with Amplifier Speed Switch attached to back of speedometer

Red: switch signal
Yellow spade: IGN
Yellow bullet(?): output signal > green harness wire

620 with AM7200 switch - wiring differs (see Ratsun}



The cluster contains:

* Fuel Gauge (Petrol/Gas gauge). See Fuel Gauge Wiring
* Water temperature gauge. See Temperature Gauge Wiring
Indicator lamps (see "Dash Lights" below)
* High beam indicator lamp (M.B.)
* Left Turn Signal indicator lamp
* Right Turn Signal indicator lamp
Warning lamps (see "Dash Lights" below)
* Brake failure lamp (Japan GL & USA)
* CHG/IGN failure lamp
* Oil pressure indicator lamp
* Tachometer. See Tachometer Wiring
* Clock. See Clock Wiring


The coolant/water temperature gauge incorporates a voltage regulator.

* If both the water and fuel gauges are off, suspect the regulator
* If only one gauge is incorrect, suspect a bad connection, usually at the sender
See main articles:
Fuel Gauge Wiring
Temperature Gauge Wiring

Dash Lights

Dash lights are idiot lights and illumination lights.

Dash Lamps
- M.B.
- Turn Signals (direction indicators)
- Illumination lights

Pre-start Check

These dash lights should light up when you turn the key to ON, before you start the car:

  • OIL pressure lamp
  • CHG lamp

Both should go out as soon as the engine is started.

These do NOT light up on the pre-start check:

  • Brake lamp
  • Beam/M.B. lamp

Troubleshooting Oil Light

Low Oil Pressure warning lamp
27747.jpgAlbum 27747

The sensor for the Oil pressure lamp is on the fuel pump just above the oil filter (left side of A-series engine):
27746.jpgAlbum 27746

The sensor is for an "idiot light". It simply connects the wire to ground when there is oil pressure. So before you start the engine (IGN key on), the Oil lamp bulb is connected to earth/ground through this switch and lights up. As soon as the engine starts and pressure builds, it disconnects the ground circuit so that lamp goes off.

If the lamp never lights up (IGN key on, engine not started):

  1. Be sure the wire at the oil pump is connected to the connector
  2. Pull it off and then on again to ensue it is tightly connected. If it is not, you can slightly crimp it with pliers to make it fit better

Check the lamp again. If it still doesn't come on:

  1. Reach behind the dash and twist the bulb out. If it is burnt out, replace it

If the light comes on (IGN key on, engine not started), but does not go *off* when the engine starts:

  1. Be sure the wire at the oil pump is connected to the spade connector. If it is off and lying against the engine or body is has a natural earth/ground and so won't work correctly

If that is not the problem:

  • Disconnect the wire at the pump. Place it where it doesn't touch metal. Test the light again (with IGN key on):
    • Light is off: replace the sensor. One from most any Datsun model will fit.
    • Light stays on: You've got an unusual problem with the wiring or dash gauge cluster

This test is for functionality of the light. You don't need to start the engine to test this. If the light checks out OK, but there is no pressure or you suspect so, see Lubrication System Diagnoses.

Troubleshooting Dash Lights

After more than 30 years, these sometimes don't work. Could be a burnt-out bulb, corroded contact, or broken wire (turn signal indicators use wires).

Testing dash lights
5024.jpgAlbum 5024

Cleaning dash light contacts
5025.jpgAlbum 5025

Clean the contacts with a pencil eraser, sandpaper, or electrical contact cleaner.

Turn Signal Lamps

The dash indicator lamps should light when the IGN in ON, and the turn signal lever is moved up or down. If the exterior indicator lamps come on, but not the dash lamp, it's time to look more closely at the dash.

  • Front or Rear indicators don't come on: Not a dash problem. Check Turn Signals
  • Both L and R dash lamps don't come on: Flash can problem? Dash not grounded? See below
  • One dash lamp doesn't work L or R -- examine dash wiring as follows

For Round Gauge dash, the indicators are on each side of the Speedometer at the top.
27745.jpgAlbum 27745
Pin 3 (Green/Black wire) Turn Signal Right circuit (12V supplied by Turn Signal Switch)
Pin 5 (Green/Red wire) Turn Signal Left circuit (12V supplied by Turn Signal Switch)
Earth: Tab at bottom of cluster

If you're getting 12V at the round connector, but the lamp doesn't light, check the bulb, and the connections. The bulb socket wire connects to the cluster with a spade connector, and sometimes the spade terminal on the cluster will break off. Be careful when removing the wire!

The bulb is earthed via contact with the cluster metal body. If the socket or the spade connector is slightly corroded, the bulb may not work. A pencil eraser will clean up the brass coating. The bottom contact is some kind of lead, and can be scraped clean with a screwdriver tip.
174_56cd8c355215d.jpgPost 476592

Illumination Lamps

The lamps should light when the Lighting Switch is in the Park or Headlamps position.

NOTE: For AUS-spec 1200s, twist the light switch bulb. 
This bright/dim function may be broken and only work in one position.

For Round Gauge dash, there are two bulbs in the Speedometer and one bulb in the center of the combo gauge.
27742.jpgAlbum 27742
Pin 4- Illumination Lamp circuit (12V supplied by Lighting Switch)
26592.jpgAlbum 26592

Master Beam Pilot Lamp

M.B. or BEAM light goes on when headlights are on and Dimmer Switch is flipped forward.

27744.jpgAlbum 27744

One of the pins is 12V and one is Ground. With headlights on, check for both signals when switch is pushed forward. If there is no 12V, check the H fuse. With switch in Low Beam position both pins will be 12V unless the bulb is burned out.

Ground Pin: RW or RY or B
Supply Pin: RW or RY
See Meter Connector section above
Differing various years per Wiring diagrams
* So check your actual car
        UK  WW  intro 1971 1972 1973 1978 1989
Supply: RY  RY  RW    RW   RY   RY   RW   RW
Ground: RY  RW  RY    RY   RW   RY   B    ?
        620        1978       120Y
Supply: RW Pin 10  RW Pin 11  RW Pin 8
Ground: B  Pin 11  B  Pin 10  B  Pin 4

M.B. Wiring Schematic
27743.jpgAlbum 27743

Reference: Wiring Diagram
Reference: Lamp Wiring


See Main Article: Brake_Wiring#Schematic


  • Illumination lights are earthed via the dash.
  • Warning lights and gauges are not earthed via dash, but instead through the wiring harness connector

SO, When checking the dash illumination lights, cluster must be earthed by bolting it to the dash frame. Alternatively, for testing, a temporary jumper cable may be attached from the tab to the metal frame.

Tab at bottom must be screwed to dash
18702.jpgAlbum 18702 

Retrieved from ""

This page has been accessed 73,564 times. This page was last modified 19:49, 27 October 2022. Content is available under Datsun 1200 Club.