Input pins of the rev meter - how to wire?

[Dantler]

Hi Guys,

I'm new here, so greetings to everybody. When I look out of my window, I have a straight look at the place where my car was born 31 1/2 years ago, so you might guess where I am coming from.

I have a specific question, hope somebody can help:

How shall I wire the rev meter for testing? The Pin identification says following:

2-
2+
1-
1+

I know I need 12V, ground and a PWM-signal with 10-12V amplitude and 50% Duty cycle (got all three), but I just don't know how to wire.

Try and error might be dangerous for the hardware, so hope anybody knows

Thank you!

[Gregs///M]

There is nothing wrong with your tach, most likely. Of the hundreds of clusters I have rebuilt, I've never seen the tach itself fail. 99% of the time the non working tach is a failed SI board.


The tachometer is not designed to be driven with 12v, ground, and PWM directly, it is a 4 wire bipolar motor. You will need a tachometer driver circuit, that is exactly what the SI board does.