tacho signal wire in gq 1993 tb42

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26th November 2011, 09:19 AM
304troll

tacho signal wire in gq 1993 tb42

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
26th November 2011, 11:03 AM
NissanGQ4.2

1 Attachment(s)

This should help

Attachment 10249

Cheers

Todd
27th November 2011, 07:01 PM
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 :)
27th November 2011, 07:06 PM
NissanGQ4.2

Quote:

Originally Posted by 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 :)

No worries, I'm guessing that diagram helped you out?
27th November 2011, 07:47 PM
304troll

Yeah man did the trick might even get enthusiastic and rig up the oil pressure gauge now lol
27th November 2011, 07:51 PM
NissanGQ4.2

Quote:

Originally Posted by 304troll

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*
25th April 2012, 05:03 PM
eddietrx

The standard tacho will not be accurate as it is for a 6 and not an 8
22nd February 2025, 04:44 PM
Kingrobert98

Quote:

Originally Posted by NissanGQ4.2

This should help

Attachment 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
22nd February 2025, 11:37 PM
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.
23rd February 2025, 05:46 PM
Kingrobert98

[QUOTE=mudnut;849604]

Quote:

Originally Posted by Kingrobert98

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.
23rd February 2025, 06:23 PM
mudnut

[QUOTE=Kingrobert98;849607]

Quote:

Originally Posted by mudnut

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.