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I have a 1989 F350 that I just bought today, and While driving it home, I noticed the Cluster wasn't working properly.
The Speedometer wasn't working, had to have my brother pull ahead of me and set his cruise control so I could still obey the speed limit, the Odometer and Trip-Meter weren't functioning, I had to pull ahead of my brother for a fuel run on his car, and when I hit an est. 70-75Mph, the speedo went crazy (Bouncing between 35-50 erratically) and the Odometer and Trip-Meter increased by .2 miles, after I slowed back down, the speedo went dead again.
I have the ZF Trans which has less than 1400miles on it, and do not know the connector location.
The other instruments not working are listed below.
*Oil Pressure, Dead pegged and a replacement had been installed that operates.
*Fuel Gauge, pinned past "F", after 8.179 Gallons, it sat dead on "F", this truck was built for long distance towing/travel, so the exact capacity is unknown at this time.
*Temp, I highly doubt at the motor was at the first notch after "C" with a constant 2400RPMs in 5th gear.
Your speed will be cable operated. The connection will be on the transfer case, not the trans. You may have a broken cable or a stripped plastic gear on the end of the cable. Pull it out of the transfer case and have a look.
Gauges I don`t know, maybe bad fuel sender in tank or bad electrical connections. Oip press maybe bad sender unit at engine.
The family and I went to Laramie today, my brother took my wife and son with him in my wife's car, and I took the truck (my youngest brother wanted to see it) halfway through the trip, the speedo went completely spastic, finally it stabilized around 65, I called my wife and asked her what speed they were going, she told me 65, so somehow........it's working again