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Ok, here we go.... I tried hot wiring the car and it still won't fire the fuel pump. The ignition comes on and the engine turns over, but no pump action. I tested the wires at the ignition switch connector and all have the proper continuity and voltage. The tach connector on the wiring harness side has five contacts, but only three are used (#4 which is a ground, # 5 is 12V and #6 has continuity with the green wire on the coil). All these check good. Does this mean the circuitry in the tach is bad? Is there a way to test the tach? Is there some other part I've missed? I have some electronic test equipment and basic circuitry knowledge, but can't go too deep. Sorry guys, but I'm just an old shade-tree mechanic with no Porsche experience.
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