tacho signal wire in gq 1993 tb42

[304troll]

Hi everyone does any one know the colour of the wire that connects to the tacho either in the dash or at the computer plug of a GQ patrol 1993 as i have done an engine conversion and want to hook the tacho back up so i need the wire colour/location to hook the interface signal converter

vehicle was a (tb42 EFI) now converted to a holden 5 litre
just want some form of idea how hard im pushin my rig


Cheers heaps for the help

[NissanGQ4.2]

This should help

10249

Cheers

Todd

[304troll]

Todd my friend you are a bloody champion cheers bro if ya ever around millicent sa hook me up so i can buy ya a beer or somethin :)

[NissanGQ4.2]

Todd my friend you are a bloody champion cheers bro if ya ever around millicent sa hook me up so i can buy ya a beer or somethin :)

No worries, I'm guessing that diagram helped you out?

[304troll]

Yeah man did the trick might even get enthusiastic and rig up the oil pressure gauge now lol

[NissanGQ4.2]

Yeah man did the trick might even get enthusiastic and rig up the oil pressure gauge now lol

Don't get 2 carried away *L*

[eddietrx]

The standard tacho will not be accurate as it is for a 6 and not an 8

[Kingrobert98]

This should help

10249

Cheers

Todd

Gday I know this is an old thread but if I was to be running a carby set up could I take that yellow and black wire from the ecu plug and put it to the negative side of the coil for the tacho to work

[mudnut]

[QUOTE=Kingrobert98;849598]Gday I know this is an old thread but if I was to be running a carby set up could I take that yellow and black wire from the ecu plug and put it to the negative side of the coil for the tacho to work[/QUOTE

You will need to establish if the ECM ( engine control module) is still providing a viable signal. The TB42S (carby) gets a signal from the coil or some use an engine revolution sensor to provide that signal. Maybe you can obtain a carby tacho, swap it out of the gauge cluster and rewire it to the coil.

Download the workshop manuals to see what works for you.

[Kingrobert98]

[QUOTE=Kingrobert98;849598]Gday I know this is an old thread but if I was to be running a carby set up could I take that yellow and black wire from the ecu plug and put it to the negative side of the coil for the tacho to work[/QUOTE

You will need to establish if the ECM ( engine control module) is still providing a viable signal. The TB42S (carby) gets a signal from the coil or some use an engine revolution sensor to provide that signal. Maybe you can obtain a carby tacho, swap it out of the gauge cluster and rewire it to the coil.

Download the workshop manuals to see what works for you.

Thanks for the reply mate I’ll look into the carby tacho. Have you any idea where the ecu for the tb42e gets the signal to send to the tacho.

[mudnut]

[QUOTE=mudnut;849604]

Thanks for the reply mate I’ll look into the carby tacho. Have you any idea where the ecu for the tb42e gets the signal to send to the tacho.

Page 12-21 shows a Grey/red wire to the coil resistor and condensor or a White/green wire to the power transistor. I don't know which is the input to the ECU, I'm guessing its the Grey/ red one and the White green is the output to run the transistor. You'll need a mutimeter with a Frequency meter(Hz) to check.