Everything else works, just had to swap the oilpressure senor
to one that uses the same signal type as the gauge.

But the tach is dead?! After some looking i found out that
there is another tachwire on the engine for "analog" gauges.

Tried to connect that wire to the tachometer but with the same result.

How do I proceed? Can I measure the signal somehow?
To see if there is any signal? I dont think the gauge is broken?
If possible I would like to keep the original look on the dash...