If you have ever fitted an after market ECU to your street car or a race car and kept the original electronic Alfa tacho that was previously driven off the coil negative circuit only to find that it now doesn't work ?
Well, rescue is at hand. Try this simple gem of a circuit courtesy of Motec Australia.
Hint, if you pull the relay apart and disable the contacts, it wont rattle when its working. Its only the coil that is necessary.
Cheers, MD
(Barry, thanks for the inspiration mate)
Tacho driver circuit
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Transaxle Alfas Haul More Arse