adding a tach

[Pirikka]

Hi
I have -90 mk2 golf that used to be petrol and its replaced with 1z diesel.
How can i get the rev gauge to work?
I looked at that link and the circuit board is different in my car.

[vanbcguy]

The diesel tach gets its signal from the alternator - there's a "W"  terminal on a proper diesel alt that is connected to one of the field windings in the alternator. It is a much higher frequency signal than a gasser tach expects, like around 10:1.

There's a few ways you can go:

- install a diesel cluster
- buy a Dakota Digital box to convert the diesel tach signal to something the gasser tach can understand
- rig up an alternative pickup for the RPM signal - there's some examples of that approach around on the forum

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