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[Datsun 1200 encyclopedia]

Tachometer

From Datsun 1200 Club

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Categories: Body Electrical System | Options

Optional for the Datsun 1200 was an 8,000 RPM Kanto-Seiki tachometer. It was usually housed in the round-gauge instrument panel to the left of the speedometer. It may also be placed in the optional floor console.

Contents

Overview

1972 USA Owners manual

29368.jpg08   29369.jpg09
The tachometer is electrically operated and indicates engine speed calibrated in hundreds of revolutions per minute (rpm). two color zones are on its face. For normal driving, your vehicle should be driven in the yellow or non-color sectors.

The standard tachometer has a 6400 rpm redline
21197.jpgAlbum 21197

PB110
2129.jpgAlbum 2129

Options - Tachometer was optional on DX or GL round dash models. Standard equipment on the GX.
2209.jpgArticle click to go 174_56da19535f43b.jpg

S1 | SSS
50.JPGAlbum 50 6595.jpgAlbum 6595

Ute can be retro-fitted with a tacho. No factory tachometer is listed for Sunny Truck, but only a Clock. Even so it is common to see tachometers installed in 1200 Trucks, as they fit the same.
5153.jpgAlbum 5153

B140
8985.jpgAlbum 8985

Bottom stay is the ground/earth point
174_5d61ccb70965d.jpgPost 492373

Location

The factory Parts Catalog shows GL came with a clock in the dash, while the GX came with an 8,000 RPM tachometer in the dash and the clock was moved to the floor console.

Dash

B110
6598.jpgAlbum 6598 3700.jpgAlbum 3700

PB110
11440.jpgAlbum 11440

Dash Fitting

Mounting tabs (red arrows). The plastic lens is attached with three smaller screws (yellow arrows).
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Remove the facia with attached gauges from the dashboard
3376.jpgAlbum 3376

Unscrew the blanking plate
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Finally, use the three screws to attach the tachometer
174_5d65dab2369bf.jpgPost 492390

Tacho in dash, blank plate in Console

factory GL configuration

7730.jpgAlbum 7730 286.jpgAlbum 286

Tacho in dash, Clock in Console

factory GX configuration

1350.jpgAlbum 1350 5703.jpgAlbum 5703

Tacho in Console

Specials Datsun 1200 SSS and Datsun 1200 S1 placed the tachometer in the floor console. It is preferable to have the Tachometer at eye-level, however these models came with square-gauge dashes so the large round tachometer was placed in the console.

SSS | S1
6595.jpgAlbum 6595 50.JPGAlbum 50

The factory tachometer was not designed to bolt to the console. But is will fit if you make a simple bracket to hold it in place.

Wiring

2708.jpg

Part Numbers

#H18 24855-H1800 1200 TACHOMETER 8000 RPM [6400 redline]
26335.jpgAlbum 26335
#H23 24855-H2300 1200 TACHOMETER 8000 RPM GX
tach_4cyl.jpg
#24855-H1075 1200 FACTORY RACE TACHOMETER 
* Calibrated to 10,000 RPM with adjustable redline needle
26346.jpgAlbum 26346
#H31 24855-H3100 1972 B110 8000 RPM [Facelift] (Except GX)
#H34 24855-H3400 1972 B110 GX 8000 RPM [Facelift 6800 redline]
26738.jpgAlbum 26738

364/384 facelift tachometer plastic on old-style tachometer
364tacho.jpg 364tacho_.jpg

26061-B140 Allied Engineering for B140
26990.jpgAlbum 26990 174_589e901cb017b.jpgPost 483841

H18

H18 is the Coupe Applied Model Code. This same tachometer was optional on Sedan.

24855-H1800 1200 TACHOMETER 8000 RPM [6400 redline]

26335.jpgAlbum 26335 26333.jpgAlbum 26333 26334.jpgAlbum 26334

1691.jpgAlbum 1691 1690.jpgAlbum 1690

24855-H1800.jpg 24855-H1800_.jpg 24855-H1800-.jpg

Facelift

The 1972 minor facelift made several changes to the tachometer.

H31: DX, GL option (6400 RPM redline)
#H34: GX with 6800 RPM redline

New anti-glare cover (cone shaped)
26741.jpgAlbum 26741

New Font, new colors
18919.jpgAlbum 18919

Now includes long stay to reach hooded facia
26738.jpgAlbum 26738

Gauges have long-reach brackets, but old tacho will bolt up
26344.jpgAlbum 26344

Old tachometer installed using flat-plastic cover

26345.jpgAlbum 26345 26343.jpgAlbum 26343

H34

1972 minor facelift tachometer came with new plastic anti-glare cover (cone shaped).
26741.jpgAlbum 26741

New Font, new colors
18706.jpgAlbum 18706 18707.jpgAlbum 18707

#H34 - includes long top stay to reach hooded facia (GX: 6800 RPM redline)
26738.jpgAlbum 26738 26739.jpgAlbum 26739 26740.jpgAlbum 26740 174_5d61cca64f140.jpgPost 492373 174_5d61ccaf8f96e.jpgPost 492373

H34 with original wiring (current loop)
18919.jpgAlbum 18919 18920.jpgAlbum 18920

Adjustment

Adjust the RPMs using the trimmer slot on the back of the tachometer. Take a reading using a dedicated (accurate) Dwell-Tachometer, and if your tachometer reads off, adjust it to match.
28522.jpgAlbum 28522

The factory tachometers have an adjustment via is a trimmer pot (potentiometer) on the back of the tachometer. Use a thin screwdriver to make the adjustment. It can be accessed from the back of the tachometer. The access hole is above the bottom tab. Rotate the pot clockwise or anti-clockwise to adjust.

Yellow Arrow points to the trimmer pot
28523.jpgAlbum 28523

Electronic Ignition

The stock tachometer works with most types of Electronic Ignition.

  • If using a single coil with the stock ballast resistor, works the same
  • If using coil packs, use the "Tach Out" signal on the ECU or Ignition Controller
  • Early tach (current loop type): If using a "high energy" system (no ballast resistor) you may need to add a 1.5 ohm resistor inline with the tach wire

The tach may jump around and misbehave with a new ignition module. A condenser on the coil negative wire can help with this.

V8

The stock tachometer will work with a V8 engine, but will read half of the actual engine speed.

Ditto for a six-cylinder engine (inline i6 or V6), it will read 1/3 slow. This can sometimes be compensated using the #Adjusment on the back of the tachometer.

For a V8, add a 15k ohm resistor between the tachometer circuit board and the tachometer movement.

LATE 1200 tachometer (voltage sense type)
8-cylinder 15k resistor

Some later Datsuns use a 2.2k resistor inline with the coil to reduce noise. In a 280Z it is located in the passenger side footwell. In a 720 it is located in the engine compartment. This resistor is not needed for proper tachometer operation but can help in electrically noisy environment.

620 Tachometer

The Datsun 620 truck tachometers fits Datsun 1200 and looks very similar. But 620 models with L20B engine have 7000 rpm red line (1200 tach has 6400 or 6800 rpm redline).

1976-1979 USA 620 Tachometer [7000 redline]
24855-B8000.jpg 16721.jpgAlbum 16721

620 in Japan did not have a factory tachometer option.

1972-1975 early 620 USA
* 24840-B6400 KIT-TACHOMETER OP -0775
* 24054-B6400 ASSY-CABLE,TACHOMETER
9997.jpgAlbum 9997
1976-1979 late 620 USA
* 24855-B8000 ASSY-TACHOMETER OP 0875-
* tachometer wiring is built into every 1976-1979 620

The later Tachometer Wiring is different. It is a typical tap connection, instead of the Datsun 1200 'passthru' induction wiring.

Comparison

1200 and 620 tachs are wired completely different. See Tachometer Wiring.

620 Tachometer has no wiring loop:
Pdr_0312a.jpg

Early 1200 Tachometer has wiring loop:
18920.jpgAlbum 18920

Bprojects

Bprojects Sunny Truck tachometer, looks like genuine dash tachometer, but has different redline. It mounts in the dash, and is lacking console mounting brackets.

6500 RPM redline
b110-tacho-003.jpg b110-tacho-003003.jpg

Green to Illumination
Black to Earth
Red to I/G 12V
Yellow/red to ignition coil - (minus)

b110-tacho-007.jpg b110-tacho-008.jpg b110-tacho-005.jpg b110-tacho-006.jpg b110-tacho-004.jpg

Nissan Competition

1984 Nissan Competition Catalog
Competition198442.jpg

TACHOMETERS


#H18 24855-H1800 is the stock factory OPTION tachometer
24855-H1800.jpg

#24855-H1075 is the 10,000 RPM tachometer
174_5d70d4cee755d.jpg

10,000 RPM Tachometer

Sunny Sport option
174_5d70d4cee755d.jpgPost 492473

As you can see, the 10k tachometer has the same case, same font, same wiring. Only the faceplate is different and a moveable tell-tale pointer has been added.
26346.jpgAlbum 26346 26347.jpgAlbum 26347 1537.jpgAlbum 1537 3235.jpgAlbum 3235 174_5d70d4fa1ca27.jpgPost 492473 174_5d70d50fb2c60.jpgPost 492473

This one appears to be using the standard lens, with the tell-tale knob having been removed, wires cut, power post missing, and lower mounting bracket hacksawed off
174_5d715b4559d9e.jpgPost 492475 174_5d715b4dd5314.jpgPost 492475 174_5d715b3c70d61.jpgPost 492475

12,000 RPM Tachometer

Kanto Seiki 12,000 RPM tacho.
26339.jpgAlbum 26339

Mechanical Drive

Datsun Competition offered a mechanical tachometer.

23338.jpg

Aftermarket Tachometers

Photo Index

601.jpgAlbum 601 957.jpgAlbum 957 958.jpgAlbum 958 1087.jpgAlbum 1087 1132.jpgAlbum 1132 1411.jpgAlbum 1411 1801.jpgAlbum 1801 1886.jpgAlbum 1886 2041.jpgAlbum 2041 2192.jpgAlbum 2192 3940.jpgAlbum 3940 5043.jpgAlbum 5043 7769.jpgAlbum 7769 8764.jpgAlbum 8764 8840.jpgAlbum 8840 8882.jpgAlbum 8882 9732.jpgAlbum 9732 10710.jpgAlbum 10710 10761.jpgAlbum 10761 13689.jpgAlbum 13689 13883.jpgAlbum 13883 14194.jpgAlbum 14194

rev counter tacho tach rpm gauge タコメータ 

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This page has been accessed 67,496 times. This page was last modified 04:28, 28 December 2023. Content is available under Datsun 1200 Club.