Tach / Tachometer not working, changed and not wired

[Fredo]

So when I bought this 86' MJ with a 4.0l 5 spd had on Tachometer, I switch  instrument cluster but TACH still not working, looking at the engine, I see the distributor is not the original, so, apparently this was changed thus it was not wire to the cluster (this is my conclusion) my question is, is there a wire diagram an one can share and/or, any one know how to connect it?

[Agreen]

https://comancheclub.com/topic/69073-86-tach-wiring/#comment-738143

 

The 86 didn't come with the 4.0 as an option. You either have a 4 CYLINDER 2.5 Liter engine, a 2.8 GM V6 (like the one that was in the S10), or a 2.1 diesel engine.

[Fredo]

3 hours ago, Agreen said:

https://comancheclub.com/topic/69073-86-tach-wiring/#comment-738143

 

The 86 didn't come with the 4.0 as an option. You either have a 4 CYLINDER 2.5 Liter engine, a 2.8 GM V6 (like the one that was in the S10), or a 2.1 diesel engine.

thanks, but if is not an 86 is an 84, but I know for a fact is a 4.0L..  is a 6 cylinder engine

[Agreen]

It's at least an 87, since it has the 4.0. You can disregard the earlier link. That is specific to the 86 comanche (and 84-86 cherokees).

[Fredo]

6 hours ago, Agreen said:

It's at least an 87, since it has the 4.0. You can disregard the earlier link. That is specific to the 86 comanche (and 84-86 cherokees).

thanks!

[eaglescout526]

14 hours ago, Fredo said:

thanks, but if is not an 86 is an 84, but I know for a fact is a 4.0L..  is a 6 cylinder engine

 

8 hours ago, Agreen said:

It's at least an 87, since it has the 4.0. You can disregard the earlier link. That is specific to the 86 comanche (and 84-86 cherokees).

 

It is an 87, the hood rod is still in the 84-86 location which was still there on the 1986 produced 87 MJs.

 

As for your tach issue, you will not find the tach signal on your distributor, you will find it on one of the plugs at the bottom of the ICM(Igniton Control Module) that has the coil mounted on top. The tach signal should be a green wire, someone will correct me if I am wrong about that.