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I should have updated this a few weeks back... Alan (the maker of the device) as a last ditch effort had me remove a tiny capacitor on the PCB labelled C19. I have no idea what it was for or why, but it worked and I had no issues picking up the RPM signal from pin21 on the DME which is the same as taking the single from the black/violet wire on the back of the tach. He said that once removed you would no longer have the option to pick up the signal from the low side of the coil or the injector ground. I had tried both these locations prior to the modification with no success either.
Unit works as expected now.
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