My friends 99 GTX has never had the speed sensor working. We bought a new one. While testing the new one we noticed no difference in the old to the new. (meaning neither of them worked) Performing the test in the manual you will see 5-8.5 v pulse when the wheel is spun slowly with your finger. We are only getting about 3 volts. With no pulse to a higher voltage.

Has anyone ever had this happen?