Tach Gauge
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I have an Isspro 4k on my '93. My truck had a factory hookup for a dealer installed tach. It's a gray 4-prong plug tied up by the fuse block. Wire colors are gray, orange and two black. Call Don at Isspro (503-528-3402). He's real nice, he'll know exactly how to help you. He can tell you what you need to hook up a tach. I'm not sure if the '90s had the plug like mine does, but Don can get you sensor to mount if your truck doesn't have the plug.
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on my auto 93 theres a 4 pin plug under the drivers side of the dash but the problem is any tach u buy has to be able to read a half of a volt which nothing u can get off the shelf @ your local parts store can read corectly the best thing u can do is buy a tach kit which would go on your harmonic balancer or buy a crank sensor & a voltage inducer or go to tiny tach & buy one of the kits they have it looks like an hour meter on heavy machinery the way this tach works is by a magnetic ring that wraps around your number 1 injector & reads the engine rpm by the amount of fuel that flows thru your number 1 injector supposed to be very acurate & i find it 2 be a rather ingenious way of measureing rpms once i have the money saved up im going 2 invest in one & try it out myself