89 Cheyenne gauges upgrade

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kmehr

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I have an 89 Cheyenne with the two gauge cluster, speedo and fuel level. I would really love to have a little more info on what is going on with my engine. What is involved in swapping to a cluster that has the voltage, water temp and oil pressure gauges? Would it just be easier to throw on a pillar gauge pod?
 

Brady

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Do you have the 'moonie' cluster and you're wanting to swap to a 'needle' 91.5-94 gauge cluster?
 

kmehr

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I have the moonie cluster, but only with two gauges. i want to swap to the Moonie cluster with 5 gauges
 

Brady

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I'm not sure about your situation. But I'd dare say it's almost a direct swap. You'll have to burn in a DRAC switch to your new 'moonie' cluster in order to calibrate the speedo if it's from a truck with different stock gears and size tires. Does the back of your cluster look like this?
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kmehr

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I haven't taken it apart yet. couldn't I just swap over the odometer? ( i think I read where they are removable)
 

Brady

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I'm currently swapping a '91 'needle w/tach' cluster into my '90 350/5spd Cheyenne. It's a bit more complicated then working with the GMT-800 clusters. If you're close, I'd dam near give you my 5 gauge moonie.
 

Brady

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I haven't taken it apart yet. couldn't I just swap over the odometer? ( i think I read where they are removable)

Yes there's a thread about that sure, but unless the donor cluster has the SAME gears and tire size (in stock form) your speedometer will be off unless you modify the INTERNAL DRAC of the cluster. I say INTERNAL in caps because I spent a few hours chasing an imaginary external DRAC in my truck. Yours is internal as well.
 

kmehr

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I have 3.42 gears, but had the tiny tires stock, I upgraded to larger tires so it's already off 7%. IS your's similar? what would you want for it?
 

Brady

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PM sent....

I still maintain in modifying the DRAC. Will let you adjust to gear & tire changes in the future as well.

*Edit - I don't know if it's actually called DRAC on the 88-91 trucks. But in any case, a DIP switch is soldered onto the circuit board that allows the user to calibrate the speedometer. In 92 is when they started with an external DRAC unit.
 
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