My speedometer Quit in my 86 T and I dont have much experience in that area. It quit and started making a zinging noise after I got on it. I drove it last night and it still does not work and makes the same zinging noise when the car is moving. I noticed it does try to move when the car is in reverse. Can you fine folks give me some advise on what to look for to trouble shoot this issue. I dont want to drive the car until Its fixed. Thanks for your help.