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Bench testing (indoors, warm/dry, good lighting) with a 24V source and drill hooked up like you said. Great idea.

Two possibilities come to mind. 1 - is the sender drive off the block working? Does is spin when the engine's running? Not 100% sure how you'd test this, but I don't think oil's going to spray out under pressure if you run the engine without the sender connected. 2 - something's wrong with...

My sender was toast. Before buttoning everything up, I ran 24 jumpers to the tach, and jumpers from the plug-end of the new sender. TNriverjet was kind enough to send another tach on the suspicion mine may have been faulty - it wasn’t - I offered to send it back, he asked me to “pay it...

Someone with an EE degree can correct me here (not an EE, but a Ham and I've tinkered with some electronic projects in the past), but I think adding something like a 100 microfarad 50 volt electrolytic capacitor across the voltage screws (+/-) can smooth some of that out a bit by attenuating the...