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I just solved this problem on my 1997 with 183K miles . First I checked all of the following:1) sensor on distributor; 2) wires from distributor to back of instrument cluster; 3) connections of wires to instrument cluster; 4) 4 screens going through the soft circuit board to tachometer; 5) the SOLUTION- I removed the tachometer from the instrument cluster and looked at the hard circuit board of the tachometer. On one side there is a plastic square housing about 1/4 x 3/8" soldered to the circuit board that has a plastic screw facing out. it was lose, so I tighten it and now my tachometer is OK. A simple test to check for this type of an error is hit your dash when the tachometer is erratic. if you see a fluctuation based on the tap on the dash you either have a lose connection of some type like this one. Fix is easy, once you have the instrument cluster out you only have to remove the four screws on the back of the cluster holding the tachometer in place. Remove the tachometer carefully and tighten the plastic screw being careful not to over tighten.
i had a 2001 aurora with the same exact problem. lucky for me a drunk driver smashed into it with a plow truck and it tumbled down a cliff into a river while it was parked and they gave me 12k for the car that i paid 8900 for .
i beilive its and ignition problem
IT'S A BLUE WIRE ON THE BACK OF THE CONNECTOR THAT WOULD NORMALLY GO TO THE FACTORY TACHOMETER IN THE DASH. YOU HAVE TO REMOVE THE DASH GAUGE CLUSTER TO GET AT THE CONNECTOR. THE CONNECTOR WILL NOT BE PLUGGED INTO ANYTHING IF YOU DON'T HAVE A FACTORY TACHOMETER (DX, CX, HX ETC...YOU WILL HAVE TO SPLICE INTO OR CUT THE BLUE WIRE FROM THE PLUG. IT GOES TO TACH SIGNAL WIRE ON YOUR NEW TACH.