Quote:
Originally Posted by Felching
The EGR computer controls the tach and replaces the old tach amp. It sends out the same signal.
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You sure about that? The EGR-computer cars have 144 pulses per revolution of the engine from counting flywheel teeth vs the single pulse of the crank damper pin of the non EGR-computer cars.
Let's not confuse mechanical similarity of the gauge connector with electrical compatibility. A 6 cylinder gas tach from a 126 looks identical to the 6 cylinder diesel tach and even uses the same plug, but they cannot interchange due to the frequency of the engine RPM pulse they receive.