Speedometer cable


Well-Known Member
Nov 4, 2002
87 GN analog car just installed new speedo cable . At start up put car in reverse needle jumped to 25 mph at idle. After driving 10 min the needle rest at 25mph instead of zero and showing wrong mph while driving. Scan Master and my cell phone show correct milage while driving and idle. What can cause this problem ? The sensor in back of cluster is connected.