what could cause a tachometer (both aftermarket and stock) to be jumpy. its very erratic. it didnt always do this. just started a couple of months ago. could a faulty distributor igniter cause this.
uhh erratic Tach could be your clutch is all done bro
the clutch slips all the time, and makes the revs fluctuate, even maybe not audibly. Usually this is easy to notice because of engine noise. It all depends on how erratic and when
my buddys 89 tegra had the same problem we had to replace the a senor wthin the distributor which was causing a poor spark and the altinator was also bad
i'm assuming that your engine does not rev up with the tach?
i had a similar thing happen to me, took it to a dealership,and they said the wires that attach to the coil were comming off. they re soldered them and it works fine now
It could be your coil wires. Sometimes when there is bad connections between them, the RPMs will fluctuate that way, only on the needles. Check for old or corroded wires or just bad connections in your wires.
With the aftermarket tach, are you running right off the ECU? I would also try to use a multimeter and check the RPMs that way. It could also be a short some where. Is it all the time or just at Idel? How much does it bounce?
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