Compression Ignition Addict
Join Date: Nov 2007
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It could be the PSOM (small computer module integral to the speedo). You can try swapping it with a known good unit to rule it out. If the PSOM is bad there are a few things to keep in mind:
Swapping the whole cluster is easiest but you can disassemble the cluster and swap just the speedo/PSOM. If you do a full cluster swap it has to be out of a same year rig because there are minor wiring differences among the years.
PSOM stores mileage, so whatever mileage the donor truck had will show on your truck. You can get them reprogrammed for correct mileage but its not cheap.
97 F350 CCLB 4x4 PSD
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