B210 Tachometer

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Tachometer for Datsun B210.

Overview

Datsun B210 tachometer (24855-H5100)

Datsun 720 tachometer (24855-03W00) vs Datsun B210 tachometer
full

RHD vs LHD

The plastic box that contains it is the opposite way around. i.e, a mirror image.

Right-Hand Drive

Left-Hand Drive

One-Wire vs Two-Wire

A one wire tach has ONE black/white wire not two (it also has the red wire and black wire that plug into the instrument circuit board ). I think all RHD 120Y wiring harnesses expect a two-wire tach.

Possibly you can adapt it either by soldering another black/white wire onto the tach (there is a spot), or just putting t-intersection in where the black/white wires connect on your wiring harness so that the tach is connected and the ignition circuit is still closed.

One-wire LHD

Two-wire? LHD

LHD

LHD

Wiring RHD

The tachometer is wired in series with the coil feed wire. There are two connectors that you pull apart behind the dash and connect the tach in the loop, plus it has an IGN+ wire.

RHD Wiring discussion

Wiring LHD

The tachometer is wired to the coil negative terminal. All North America (and perhaps all LHD) B210s have the tachometer wiring right there in the dash. So no cutting needed, and no new wires need to be run out to the coil.

6-pin connector with BW, B, R, RW and RB wires. One pin not connected. 

1976-1978 with the 6-pin connector
BW Coil-
B Ground
R IGN

1974
BW coil-
B to terminal 'A' on dash
R to terminal 'C' on dash 

The signal wire is brought into the dash wiring even if it didn't come with a tachometer originally.

1974: signal is a single wire in the dash harness
1976: 6-pin connector in the dash harness
1976 CALIFORNIA: signal wire comes from the electronic ignition black
     box (which is under the dash)

LHD