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Installing Autometer Tacho In R33 Gtst

VT5spd038

By VT5spd038,
in Tutorials / DIY / FAQ

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  • 1 month later...
mad082 Grand Master

mad082

Posted
Posted

just jump onto the tacho wire at the back of the dash cluster. use a test light to find out which 1 it is. it will be a thicker wire. just start the car and try all the wires with a test light. the tacho wire will flash (very fast) and if u rev it it will get brighter ( cause it is flashing faster)

SKYBEE Collaborator

SKYBEE

Posted
Posted

i might add a note when checking for tacho pulse it is important to use a led test light as these do not draw any current in which could harm igniter or ecu if you use a lighht bulb test light it could over load the circuitry causing failure

just my two cents

mad082 Grand Master

mad082

Posted
Posted

using a normal test light or an led test light won't make much difference. but it depends on that u are testing. testing the tacho wire between the ecu and the tacho will have less affect than testing between the engine and the ecu if something went wrong. and using a normal light would draw similar current to a monster tacho.

i used a normal test light on my last car when i was hooking a shift light up (still used factory tacho though. no point putting in a 5 inch tacho when there is already 1 there) and there was no problem.

fair enough to use 1 if your car doesn't have a tacho or the factory 1 is dead.

  • 1 month later...
mad082 Grand Master

mad082

Posted
Posted

just to help anyone out who is reading through, the tacho wire on the r33 ecu is a yellow with a blue stripe wire. when the ecu is still bolted in, it is in the top row (right hand side when the ecu is vertical) and 4th pin up from the centre bolt. its not the 4th wire, as some cars have different wiring configurations due to different options, but the 4th hole in the plug.

  • 5 months later...
  • 3 weeks later...
drf76 Collaborator

drf76

Posted
Posted

i have connected my rpm signal to the ecu output which does lead to the back of the cluster, but i dont know if anyone has had the same problem where the tacho doesnt read right as the output from the ecu is a 5v square wave and the autometer tacho needs 12v square wave. is there a way to fix this without buying extra modules to convert the signals.

  • 1 month later...
vuey28 Collaborator

vuey28

Posted
Posted
i have connected my rpm signal to the ecu output which does lead to the back of the cluster, but i dont know if anyone has had the same problem where the tacho doesnt read right as the output from the ecu is a 5v square wave and the autometer tacho needs 12v square wave. is there a way to fix this without buying extra modules to convert the signals.

Yeah I have the same problem.. no idea how to solve it though.. hope someone has an answer..

  • 2 years later...
dave_rb20 Enthusiast

dave_rb20

Posted
Posted
just to help anyone out who is reading through, the tacho wire on the r33 ecu is a yellow with a blue stripe wire. when the ecu is still bolted in, it is in the top row (right hand side when the ecu is vertical) and 4th pin up from the centre bolt. its not the 4th wire, as some cars have different wiring configurations due to different options, but the 4th hole in the plug.

that advice is spot on.

thanks mate, helped me to put my digital tacho in by myself.

don't seem to have the same 5v versus 12v problems as everyone else though.

it's the $99 dollar one from justjap, inbuilt shift light too :)

  • 1 year later...
Stevoss Community Regular

Stevoss

Posted
Posted

This was one of the only threads I could find that helped with installing my eboost2 so I could use the rpm function. I didnt have the instructions which are on there website, but what I came across was when connected up, the main tacho stopped working. after putting a 2k ohm resistor inline to the eboost they both now work correct.

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