Well I was driving down the road this morning and I let off the gas and the tach dropped to zero. So the first thing I thought is the engine must have stalled (very quiet exhaust), but I hit the gas and the tach raised back up. Also at highway speeds I noticed the tach is higher then normal. Has anybody seen this. Is there any fix or do I need to start hunting down a cluster.

 

Are you sure it didn't stall, and then restart with the gas pedal? Reading higher than normal could be a slipping clutch or failure of an automatic to lock-up.

So do it the easy way. Spring for a cheap tachometer http://www.autozone.com/autozone/acc...uestid=1873634 and actually measure the RPMs. Much cheaper than buying a cluster you don't need.

 

I'm betting you have an alternator going bad. Weird readings like that are usually a result of unusually low battery levels.

 

Did you ever figure this out? I have the same thing going on (just started up today) in my '94 Pickup (22RE).