Need help. First Comanche and learning the motor stuff.

[donald.wade3]

 
Not much research needed. "Type 2" clusters, used from 1988 (or late 1987) through 1990 have a potentiometer on the tachometer that allows calibrating it for 4-cylinder or 6-cylinder. There is no need to change the speedometer gear unless you change the axle gearing, or make a LARGE change in tire size.

So I can go find a cluster from 87/88-90 preferably from 6cyl and it will bolt right up and everything connects plug and play? How does the tach receive the rpm signal, through the distributer?


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[JustEmptyEveryPocket]

Confirmed, it is completely plug and play. Besides having to switch the temp and oil pressure switches for sending units. But again, that is a plug and play operation.

 

As to how the tach signal is generated, you will have to wait on someone much smarter than me.

[Eagle]

7 hours ago, donald.wade3 said:

So I can go find a cluster from 87/88-90 preferably from 6cyl and it will bolt right up and everything connects plug and play? How does the tach receive the rpm signal, through the distributer?

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The tachometer is plug-and-play if the cylinder count matches between your truck and the donor vehicle. Otherwise, you'll have to use the potentiometer to calibrate the tach. The tach signal comes, IIRC, from the ignition module. Doesn't matter -- you don't need to know where it comes from because it already goes to the wiring connector in the dashboard. Plug the connector onto the cluster and the tachometer has a signal.

 

If your original cluster has idiot lights, the oil pressure and temperature senders are ON-OFF switches that turn on the idiot light. Those two switches have to be replaced with the correct senders to operate the gauges. That's it.

[donald.wade3]

 
The tachometer is plug-and-play if the cylinder count matches between your truck and the donor vehicle. Otherwise, you'll have to use the potentiometer to calibrate the tach. The tach signal comes, IIRC, from the ignition module. Doesn't matter -- you don't need to know where it comes from because it already goes to the wiring connector in the dashboard. Plug the connector onto the cluster and the tachometer has a signal.
 
If your original cluster has idiot lights, the oil pressure and temperature senders are ON-OFF switches that turn on the idiot light. Those two switches have to be replaced with the correct senders to operate the gauges. That's it.

Yeah I have the idiot lights with no tach. Just the fuel gauge. This is one I’m going to look into for sure.


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