Irratic speedometer needle

Cruising down I-5 yesterday,my speedometer was varying between 70 and 90 mph indicated.I had later found out that the speed sensor harness next to the front disc brake had rubbed through!I made a temporary repair using a tie strap to secure the harness away from the rotor.Take a close look at yours,my wife and i have matching Majestys I secured hers too.