right I will check that is that is there any reals ya to tell if it’s the sensor or a wiring issue or do I just replace itIt may be that the speedo should move, but that is also right at the bottom of the speedo (mine starts at 10mph), and they aren't 100% accurate. Could be that it's just low enough not to actually show on the speedo.
In any event, the PCM controls the speedo; if it thinks you're only doing 17 kph at highway speeds, something between it and the speed sensor is off.
I do believe the speed sensor is on the driver's side, but it should be the only electrical connection on the tail of the trans; on my T45. You might confirm it's even the right type (if the trans is 98 or older it wouldn't be for instance).
If I have a 96-98 transmission would I have to get a 96-98 gauge cluster and have it reflashed ? Or...The 96-98s still have an electronic sending unit, the difference is it's driven by a gear in the transmission, where the newer ones uses hall effect sensor/toothed wheel.
I'd probably ID The trans first; there should be a metal tag on the transmission with the model and part numbers. Check this for more: Identify Transmission Code