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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