Hello all, I am having an issue with a recently purchased truck. It is a 1991 Chevy Cheyenne C1500 with a Muncie SM465 4-speed manual with the 4.3V6. I purchased it and had to pick it up on the other side of the state and on the return trip it worked wonderfully and made it here without a hiccup. Then all of the sudden the speedometer and odometer quit working. I checked the vehicle speed sensor and it tested a little low on resistance but replaced it anyway. That didn't work obviously. I didn't have much time to work on it today (the wife would have killed me being mothers day and all) but I did manage to visually inspect most of the wiring and completely disassembled the instrument cluster. The wiring looked fine and the cluster, although dusty, showed no signs of corrosion, burnt circuit board, or any other damage other than I may have to replace some of the bulbs later on. Next weekend or if I find time earlier I plan on doing a continuity test on all of the associated wires and a more complete visual just to rule wiring out. I am having issues finding the DRAC, speedo buffer, or whatever its called but have heard its in the cluster but I didn't see it. I am hoping its not the ECU or cluster but am not sure on how to test them. I've got a really good Fluke multimeter so if anyone knows how I sure would appreciate it. I have checked all fuses and they are fine and have also disconnected the battery for half an hour to clear the codes after replacing the VSS but still get a 24 code. I have found a schematic for the VSS circuit but am having issues finding the vehicle speed sensor buffer as I said earlier. I got my first speeding ticket in my 12 years of driving on the way to work last week so am kind of bummed my perfect record was ruined on account of not knowing how fast I'm going but oh well. That $90 would have been better spent on my truck IMHO but the trooper didn't see it that way :neutral:. Any help will be very appreciated. Thanks. Also I was wondering if some 31" tall tires on the stock 15" steelies will clear without rubbing on my truck. It is stock height and a regular cab long bed if that matters any. It looks like it will but would like to be sure before ordering them and hear from others who may have done this. Once again thanks for your time. I realize my speedo will be off roughly 4.1%, well that is if I ever get it working again :glasses:.