Tach Wire Identification behind instrument cluster (1 Viewer)

[lckarl]

Hopefully someone can help me identify/verify the tach wire color and location behind the instrument cluster in my 97 FZJ80.
I have read that the tach wire is a black wire hitting pin # 4 on Combination Meter C11. This may only be for earlier models, not sure about this. I have included a picture of Combination Meter C11, pin number 4 is empty.
A few years ago I swapped an Isuzu 4bd1t into this 80, so I can no longer trace the wire from the engine. I have a VDO tach that works for the new engine but I would like to get the factory tach working and am planning on installing a Dakota Digital universal tach interface. I need to determine what wire I can send the out signal to, preferably up near the back of the instrument cluster. If anyone happens to know the identity of the correct wire please enlighten me. Thank you.

 

[jonheld]

Connector C11 pin 11
Solid black wire.

 

[thatcabledude]

Will that converter work with the diesel engine??

 

[lckarl]

I believe so. I am leaving the VDO tach connected until I get this hooked up and can compare the factory tach reading to the VDO which I already know is working correctly. Both the VDO tach and the Dakota Digital interface will share the same signal. The Dakota should change the incoming 4 cylinder diesel signal to an outgoing signal that looks like a gas 6 cylinder. I will post up the results and let you know how it worked out.

 

[lckarl]

Connector C11 pin 11
Solid black wire.

Thank you. I thought that might be it, but I have no way of testing it. I did not want to send a signal to it until I got some confirmation that it was the correct wire.
Appreciate the feedback!

 

[mjosoba]

Did you use one of Dustin’s adapters? On mine there is a port for counting pulses off the flywheel. Mines on in situ yet though, sorry I can’t help.

 

[lckarl]

Yes I used one of Dustin"s adapters. I used a VDO inductive sender reading the pulses off of the flywheel as you mentioned. I have a working tach, but I want to get my factory tach working.

 

[LandCruisinMy93]

Will that converter work with the diesel engine??

Dakota makes a tach converter for gas to diesel conversion the DSL-1E is what I'm running.

 

[lckarl]

Dakota makes a tach converter for gas to diesel conversion the DSL-1E is what I'm running.

If this one doesn't work, I will give that one a try. What engine did you put in your truck? Where are you taking your signal from?

 

[mjosoba]

I think he has one of the Merc’s in his.

So you took the reading off of Dustin’s port, fed it into the VDO tach and just had that unit in the cab? Now you’re wanting to take it from Dustin’s port-SGI-stock tach through stock wiring?

 

[lckarl]

Yes, that is it in a nutshell! The VDO tach is nice but I have never been able to figure out where to put it. If I can get the factory tach to work correctly I will take the VDO tach out.

 

[mjosoba]

Sweet. It’ll prob be different for my ‘94, but “Coog” is doing the same swap near me now and this will be helpful to both of us. Appreciate the thread.

 

[LandCruisinMy93]

If this one doesn't work, I will give that one a try. What engine did you put in your truck? Where are you taking your signal from?

@mjosoba is correct, I went with an OM606 Mercedes motor. It has a hall-effect type tach sensor built in that I wired into. There are hall-effect type sensors you can mount on the outside of an alternator case to get the signal. You can run that through a Dakota digital and adjust proper tach speed using a photo tach sensor for reference.

 

[wiynwiyn]

Connector C11 pin 11
Solid black wire.

Hey, can you help me out. I'm trying to get the tac to work on my ls swap. I'm looking at the 96 wiring, my 80s is a 97.
Noticed C11 is a "Fuel Level Warning Light". Does the high voltage wire from the dakota goes there. Doesn't feel that is correct. Thanks all.

 

[Brindleboxer]

@wiynwiyn Here is a link to the 97 EWD. https://forum.ih8mud.com/resources/1997-land-cruiser-ewd-rm282u.221/

Pretty sure the wire you are referencing is not correct. I cannot open the EWD here at work but you should be able to find it easily.

 

[wiynwiyn]

Appreciate it. Thanks so much.

 

[Brindleboxer]

Also, thought a solution was developed not long ago to not have to run the DD box. IIRC you would program the computer and then adjust the rheostat on the back of the tach itself. The discussion is in the V8 swaps thread.

 

[wiynwiyn]

Also, thought a solution was developed not long ago to not have to run the DD box. IIRC you would program the computer and then adjust the rheostat on the back of the tach itself. The discussion is in the V8 swaps thread.

Yea, I read that. For now just want to drive the LC with a simple tac setup. I'll do that later.

 

[jonheld]

Hey, can you help me out. I'm trying to get the tac to work on my ls swap. I'm looking at the 96 wiring, my 80s is a 97.
Noticed C11 is a "Fuel Level Warning Light". Does the high voltage wire from the dakota goes there. Doesn't feel that is correct. Thanks all.

View attachment 3766247

Whatever document you're referring to is incorrect. C11 has 13 pins and is a blue connector. C13 has 16 pins.

 

[NeverFinis]

Also, thought a solution was developed not long ago to not have to run the DD box. IIRC you would program the computer and then adjust the rheostat on the back of the tach itself. The discussion is in the V8 swaps thread.

Yes, a DD Tach converter is not needed. I posted the solution in the V8 thread and in my own thread (here and here) .

The Toyota tach has a Pot that can be adjusted to match the frequency pulses from different number of cylinders (4,6,8). Either a 12V or a 5V pulse will work, except the latter requires a resistor bypass. A diesel needs to generate a RPM pulse obviously..