Quote:
Originally Posted by ls1nova71
Not sure why your speedo would read 120 at 40? Do you have it hooked up to the correct speedometer output wire? I would think if the PCM thought your MPH was that far off it wouldn't shift right either. Does the needle go to 0 when stopped?
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I have it hooked up to the VSS wire on my standalone harness. The needle goes to zero when stopped, it is just ~3x off...at 20 it reads 60, 30 = 90, etc. I am going to drive it with my OBD reader hooked up and see what it reads vs the speedo but I have to find a place to drive slow as over 40 mph the needle is pressing on the stop at 120 mph and I am afraid I may damage the needle or speedo having it maxed for long periods. I have a NV3500 manual trans. Perhaps my 3" more diameter tires, tall trans gears, and 3.08 rear end is throwing it off but it seems to be reading very excessive.