I have a 1992 Dodge diesel d250 automatic that is giving me a real hard time. The speedometer, overdrive, and cruise control are not working. I assume it is a problem with the speedometer, but I don't know what. I am out of things to try, I replaced the speed sensor and the abs sensor. Both have continuity and the gears on the VSS are in good shape.. I also fully examined the TPS and it seems to be in good order. All the fuses are good and all the other gauges work fine.
Any suggestions on what to try next would be helpful.
I need to drive this truck across country by the end of the week so I am at the point where if i could just get the overdrive to work I'd be happy. Does anyone know a way I could just put in a new overdrive switch to manually switch the vehicle over?