speedometer
 

92 RS 3.1 5 speed manual
My speedometer, tach, odometer, and tripmeter doesnt work. Every now and again the speedometer will work for a few seconds ( it will jump up and down then level out) but it is about 10 mph off. I am restoring it to original with the exception of some HP parts for the engine (cam, pistons, rods, etc.). Thanx for any help.