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The Speedometer (psom) in my 1995 F 250 with auto trans is working but sending faulty message to the computer and needs replacement. Can anyone tell me if I substitute one with the builtin tach, it the tach will work without addtional wiring or not. My mechanic is not sure if the wiring is different on the trucks originally equipped with the tach in the cluster.
An instrument cluster for your truck with a tach would plug right in. all the wiring is already included in the wiring harness that plugs into the back of the cluster.
A replacement (with tach) can be found on ebay or at your local salvage/junk yard.