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I've tried searching the forums but I can't get a straight answer. I want to run a monster tacho in my R32 GTS-4 RB20DET. I'm told the standard tacho won't hook up to the wires because the computer runs 8 volts and the tacho needs 12 volts. Is this true? I have a wiring diagram and I'm all set to go but i don't want to damage anything. Can anyone help me with this? I'm in Melbourne if anyone cares...

Thanks guys,

George.

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Run the 12 volts from your ignition, Earth is ground

The signal wire (usually green) on the autometer goes to the RPM output of your ECU.

There's prolly a white wire that goes to your lights too

I just installed an Autometer (Autoguage) Tacho in my R33 GTS-t and no problems at all.

i had a problem hooking up my tacho to the rb20det ecu, i followed the instructions and hooked all the wires up correctly power,earth and ignition. i had a problem with the ecu tacho wire its self, when i connected the tacho pulse wire to the green rpm signal wire from the tacho itself all that would happen is the tacho would go to 3000rpm and just sit there?? the car is a the auto electrican at the moment getting some other things fixed so i'll get them to look into the problem?

thanks again fellas, interesting feedback. I'll trial fit it to the computer and see if it works, before I drill holes in my car. And I'm not ungrateful for the replies but I still want more replies if possible because clearly there are different views on this.

Thanks again-

George.

  • 1 month later...

Can you hook the tacho up to the stock tacho pulse wire in the back of the dash and if you can which wire is it

any help would be great

Run the 12 volts from your ignition, Earth is ground

 

The signal wire (usually green) on the autometer goes to the RPM output of your ECU.

 

There's prolly a white wire that goes to your lights too

 

I just installed an Autometer (Autoguage) Tacho in my R33 GTS-t and no problems at all.

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