I have a 90 d150 that I put the engine and transmission from a 99 ram 1500 into. I am getting a code for p0500 "vehicle speed sensor a" would that be the sensor on the transmission or the sensor for the rear end? I still have the 90 rear end in and have plugged in the sensor into the harness but just have it tied up. Will I need to swap the rear to get rid of the code? Also I am wondering if I can tie into the speed sensor to make the speedo work, I have tried just splicing the wires in but that didn't work so I unhooked them. Is there something else i need to make the 90 computer register speed?