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Current driven Tacho

Grant Baker

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Hi Guys

I'm installing a G4+ Storm on a 1972 Datsun 240Z with a Step 2 RB25DET engine. Interesting job!

Only issue I've got at the moment is the rev counter / tacho.

It is a "4 wire" Tach which senses current from the positive side rather than having a trigger from the coil on the negative side.

I understand that there is some sort of "converter" you can buy to make this sort of Tach work with a proper ECU like the G4+s, but I'm damned if I can find anything!!!!

I'm happy to get the soldering Iron out and make a circuit up, but I'm not a full-on electronics dude, so not sure what's needed...

Any pointers?

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