I've got a 1994 yj and the speedometer no longer works. It first started a couple months ago when the speedo would sometimes work and then sometimes not, but now it never works. I have replaced the speed sensor in the back of the transfer case and i have replaced the gage cluster. Everything in the cluster works except for the speedo and the odometer. When i try to drive the jeep it will cut itself off when i downshift into first and slow down. Any suggestions on how to fix this??