[JCoop]

The RPM guage on my 84 Targa has a mind of its own. The engine runs great as always, but recently, the RPM guage fluctuates wildly and will drop to 0 or flip to 7k; sometimes it will reflect the normal range of rpm's during idle and shifting, although the baseline will be at idle 1200 when it normally would be around 800. Help! Any suggestions?