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Speedometers were either in kilometers or miles. Australia started with mph and then switched to kph via sticker overlays. Some speedometers had a trip meter.

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Overview

1972 USA Owners manual
08 09
Instrument and Controls

#Bar Speedometer
Album 28385

#Round Speedometer
Album 7725

Odograph

The odometer has five digits as shown by this 2006 unit:
Album 17172

When the count exceeds 99999 it turns back to 00000.

Album 23010

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Variations

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STD bar gauge

STD speedometer was a rectangular type (GL & GX used round gauges as did all coupes). DX varied: Mostly rectangular, but USA Deluxe had round gauges.
Album 1085

24850-B8600 B110 ute Speedometer until 1975-1978
Album 28384
24850-B8600 KANTO SEIKI TOKYO 160K km/h with wire for intermittent buzzer

サニトラバーメーターᴵ

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Round gauge

Comparo
Album 2148

For calibration, the MPH speedo is marked in KPH ranges on the very edge, which are partly visible when installed.
Album 13742

24850-H1816 100MPH w/o tripmeter (AUS/USA standard equipment)
Album 10675

?? 100MPH with tripmeter
Album 571

1973 5mph marks

24850-H3400 1200 120MPH SPEEDOMETER Includes tripmeter
Album 25954 Album 6551

140 kph
Post click for topic

160 kph

160 kph late

GX - 180 kph

#Facelift GX - 180 kph

Matsuoka - 240 kph
Album 26445

B140 2008
Album 26989 Post 483841

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Facelift GX

Gauges changed for the 1972 minor facelift in Japan. As before the GX speedometer went to 180km/h instead of the regular 160km/h. As with all 1972s it had the speed warning sensor.

Part Numbers

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Round

USA
24850-H1816 ASSY-SPEEDOMETER 100MILE/H [With 20 mph markings]
24850-H7000 ASSY-SPEEDOMETER 100MILE/H From 7/72 [With 10 mph markings]
24850-H3400 120MPH SPEEDOMETER Includes tripmeter

JDM Sunny Truck
24850-G1670 SPEEDOMETER ASSY 7804- [Round]

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Rectangle

JDM Sunny Truck
24850-G1000 SPEEDOMETER ASS'Y (up to '72-6)
24850-G1001 SPEEDOMETER ASS'Y (from '72-7 for speed buzzer) > 24850-G1000
24850-G1002 SPEEDOMETER ASS'Y (from '72-12 for intermittent buzzer) > 24850-G1001
24850-B8600 SPEEDOMETER ASSY 7510-7803 [Rectangle]

JDM Meter Kaku (Bar Gauge)
Through '70 Dec
 24850-H1000 ASS'Y-SPEEDOMETER Std
 24850-H1100 ASS'Y-SPEEDOMETER S-Dx, VDT [Van Super-Deluxe T]
 * with trip meter
From '71 Jan
 24850-H1001 ASS'Y-SPEEDOMETER S-Std
 24850-H1101 ASS'Y-SPEEDOMETER S-Dx
 * with trip meter
 24850-H1410 ASS'Y-SPEEDOMETER VS,VP [Van Standard, Van Deluxe]
 24850-H1401 ASS'Y-SPEEDOMETER VDT
 * with trip meter

H10 ? - all red lamps
Album 8400

MPH Rectangle - 0-100 Miles Per Hour
Upload click to view

B86 - Blue H.B. lamp + yellow/red zones
Album 25031

KPH+MPH
Upload click to view

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Metric-Imperial Conversion

Sometimes on eBay Australia you can get the vintage conversion stickers.
Album 923 Album 5362

print this on plain paper at 125%, for a test fit. If you like it, print on sticker stock then apply to the speedometer
Album 1101

Take the face plate and scan it on the flatbad scanner, then modify it. Finally, print a new one out with the photo printer. You can modify the font, colors, etc. You might think you can simply bolt it to the speedo using the standard screws, but it will not lay flat. Adhesive paper (sticker paper) will work
Album 15393

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Speedometer Calibration

It is normal for the speedometer to read fast. The specified tolerance is +5% -10%. So at actual 60mph it can read 57 to 66 and still be acceptable. But you can blueprint the speedometer to be closer to the actual speed.

Main: Speedometer Calibration

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Speed Buzzer

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

Main: Instrument_Panel_Wiring#Speed Buzzer

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Amplifier Speed Switch

1972 Japan, Australia late utes and 1973 USA used a speed switch.

Main: Instrument_Panel_Wiring#Speed Switch

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Alternatives

Possible fit: ^POST Smith's guage from a Triumph
Album 10754

VDO
Album 11799

220km/h coversion from Matsuoka-M
Post 491450

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Custom Faces

Main: Custom Dash Faces

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Z Speedometer

280Z speedometer fits in the 1200 dash cluster.

Swap the mounting cups as the 280Z unit is deeper
Drill a hole for the trip meter shaft through the back
The face is to large for the opening in the 1200 housing, so carefully reduce the diameter by 1/8 inch

350Z speedometer looks a similar size.
Album 14499