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Tach reading wrong!

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Old 08-14-2012, 01:57 PM
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Tach reading wrong!

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.
Old 08-14-2012, 03:04 PM
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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.
Old 08-14-2012, 08:18 PM
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I'm betting you have an alternator going bad. Weird readings like that are usually a result of unusually low battery levels.
Old 11-14-2012, 04:26 PM
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Did you ever figure this out? I have the same thing going on (just started up today) in my '94 Pickup (22RE).
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