B310 - installing orig tacho in "Non" tacho car

[D.D.Anderson]

Hey, My car was sold without the tachometer extra in the 78" model.

I did manage to get one tachometer, some says the tachometer wiring

allready is there, but i would like to ask someone who knows.

If not, i would like to buy a B310 wiring for the tacho. I haven't opened this "allmost new" car

yet so i don't know what's behind the blank B310 tachometer on the dash.

 

It didn't have a radio, but radio wiring was allready there, ready for use "Packed with nissans blue factory tape".

when i installed it.

[graveltrapp]

I would bet that there is a plug/harness waiting for your tach behind the plate. My 1200 was a non tach car from the factory and as you guessed had the plug dangling in anticipation of a tach someday coming home.

Why not get on your back with a flashlight and look and feel around before removing the cluster if you are so concerned. With a stubby phillips head screwdriver you may be able to remove the blank plate and get a much clearer shot of it.(usually just two or three short course thread screws). You will have to remove the speedo cable and the other dash light and power harness that is plugged into the rear of the cluster before being able to remove the cluster, very easy. 2-3 hours in and out.

Before snugging it all back together, make sure all the dash lights are working (bulbs and contacts) as well as the "new" tach.

[ggzilla]

Just ensure the tachometer is for a 1978-1979 dash.

[D.D.Anderson]

Just ensure the tachometer is for a 1978-1979 dash.

No problem i just got a New tachometer in supernice condition, JDM

from Japan, B310 1978 to 1979. so thumb up there! confirmed fit.

 

I don't have the oppertunity to go any further with the restoration until

snow and salt is gone in about 2 month's, more or less, i will move it from the

barn and into my mates new garage a few kilometers away.

[D.D.Anderson]

Here it is, look at this fantastic extra :)

Can't wait to get it installed.

 

[D.D.Anderson]

Bump!

 

I did fint this "3 contact" with blue factory tape behind there, its just the same as the 3 contact i got on pictured tachometer, but as u see

on this tachometer, the wires ends as 2x flat push ons and 1 round push on. The one factory taped is one-piece with my wire harness, something wrong?

 

I tok the old contact out from tach and putted the new inside dash into it.

Well i did cut the factory tape and opened it, and installed it, but it doesn't work, what more do i need to check out? 

[D.D.Anderson]

Someone make wiring diagram?

[ggzilla]

From the 1979 Factory Service Manual

It show TACH signal is white wire

 

Do you find a single White wire in the harness?

 

Black wire is earth

 

Test the wires. The light wire should go to 12V when light switch is on.

 

Here is where the factory wires go

L = blue wire. Connects to NEG terminal of coil.

 

 

TIPS:

 

* clean the wire connectors, they should be shiny bare metal. Tachometer is sensitive to connection

 

* The wiring diagram in 1979 Factory Service Manual only shows the WHITE wire for tachometer. The other two are almost certainly EARTH and LIGHT.

 

* If you wish to test the RPM indicator, earth the tachometer and run a new wire directly coil NEG terminal. After starting engine, it should indicate idle speed.

 

[pdp8]

* The wiring diagram in 1979 Factory Service Manual only shows the WHITE wire for tachometer. The other two are almost certainly EARTH and LIGHT.

 

* If you wish to test the RPM indicator, earth the tachometer and run a new wire directly coil NEG terminal. After starting engine, it should indicate idle speed.

 

Thanks for that post, the picture solved my problem since I had a tachometer but no wires out the back.

I will point out for posterity that the other wires are ground(black) and regulated power from the cluster(green) so you are likely to need all 3 wires to test.