Cluster swap

[Jeeper1093]

I have a cluster with tach from an 87 with a 4.0. Can it be swapped into and 86 with a 2.5?

[Jeeper1093]

I also have the speedo cable from the 87. Can it be swapped as well?

[eaglescout526]

If you’re going from an 84-86 Speedo and cable to an 87-90 Speedo and cable, that’s fine. But if you wanting to swap just the Speedo to the 86 cable it won’t work or vice versa. The Speedo and cable have to match since the connection to the Speedo are different. 

[Pete M]

the tach will likely be off.  but I can't remember which years might be adjustable. 

[Jeeper1093]

Thank you for the info guys! Much appreciated. I am planning on swapping both the cluster and cable so hopefully I will be good. I have a feeling that my tach is not adjustable but I will see

[fiatslug87]

Look for this white plastic screw for adjustment.

[Jeeper1093]

is this the adjuster screw?

[Jeeper1093]

😆 😆 🤣 Got it! Thanks for the help.

From what I've read I need to turn it all the way to the left correct?

 

[Jeeper1093]

like backing out?

 

[Jeeper1093]

everything seems to be working but my gas gauge. I get no movement in the needle when turning on the ignition. Any thoughts?

[Jeeper1093]

Upon further testing, I can manually move the needle to empty and turn the ignition on and the needle goes slowly to full and stays there even if the ignition is turned off

[The86manche]

26 minutes ago, Jeeper1093 said:

Upon further testing, I can manually move the needle to empty and turn the ignition on and the needle goes slowly to full and stays there even if the ignition is turned off

That means theres an open in the circut. Its either missing a ground or bad connection somewhere.

Maybe one of the tabs on the circut board on the back of the cluster got rolled up or shifted and isn't making contact.

[jdog]

Did it work on the old cluster? If so check the connectors on the back of the cluster, if you don't put them in just right it has issues

[Jeeper1093]

put the old cluster in and did the same thing. Did some testing and I believe that the sending unit has gone bad.

[The86manche]

37 minutes ago, Jeeper1093 said:

put the old cluster in and did the same thing. Did some testing and I believe that the sending unit has gone bad.

Check the grounds for the sending unit. Maybe see if it needs another ground point