Tachometer just started not registering correctly. At idle up to about 40 mph shows no rpm's. Will show rpm's on acceleration. Driving on highway rpm registers at 1100 to 1500. Speedometer is also off by 5 mph. I know this by my GPS and speedometer used to match exactly. Both problems started same time about three weeks ago. No recent repairs. Last maintenance was an oil change 2000 miles ago. About 2 months ago. Any ideas?
Thursday, February 14th, 2013 AT 12:58 AM