1985 white instrument cluster

[gogmorgo]

8 hours ago, Minuit said:

The later models have a trimmer potentiometer that works as the adjustment. If you can figure out the value and circuit position of this trimmer, no reason you couldn't do some "customization" of the tachometer and add it yourself.

When you say later, I'm assuming you're still only refering to the Renix clusters?

[Fastguy1955]

thanks everyone for the info! I appreciate all of the input!!

 

[Eagle]

3 hours ago, gogmorgo said:

When you say later, I'm assuming you're still only refering to the Renix clusters?

 

Yes, the 1988 thru 1990 clusters, the ones that use the nylon push-on connector for the speedo cable.

 

Although I assume the clusters with the electronic speedometers also have the potentiometer on the tach.

[Gat'79]

On 6/19/2019 at 11:27 AM, Eagle said:

 

You can't adjust it. That's the problem. If you have a 6-cylinder engine you have to use a cluster that came from a 6-cylinder donor vehicle. They did have two different tachometers. The 4-cylinder tachometer was part number 8350-0308. The 6-cylinder tachometer was 8350 0309.

 

Long story" Somewhere in the circuit there's a resistor. Someone who knows what it is and where it is, and who is skilled at doing printed circuit soldering, could replace the resister with one of a different value to change the tach from 4 to 6 cylinders, or from 6 to 4 cylinders. For 97.3 percent of us, that translates to "It's not adjustable."

 

The speedometer also uses a different cable connection.

I have the cluster in the photo. My Comanche is a swapped 6 and the tach doesn't work. Now I potentially know why.