Current driven Tacho

[Grant Baker]

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?

[Wockie]

http://www.dakotadigital.com/index.cfm/page/ptype=product/product_id=127/prd127.htm

Try this link it maybe what you are looking for.

[augusto]

This circuit should work in your car.

I could not send the layout and text.

Excuse me.

Augusto

[Grant Baker]

Thanks.

The circuit with the transistor won't work as the Datsun uses current, not voltage.

[jonnyt80]

http://www.viczcar.com/forum/topic/11540-converting-stock-71-240z-tacho-to-electronic-good-for-engine-conversions/

Try this if you cantfind a converter

 

[Grant Baker]

I've got hold of a "Tachmatch TM03 Boost" module, which sorts the problem

http://www.technoversions.com/TachMatchBoostSpecifications.html?