crazy tach.

[MonteC]

what would cause a tach to be really jumpy? when u rev the motor the tach goes crazy, it will reach about 4500 then above that it will jump around ALOT. yes this is in the same 84z, i swaped the entire guage cluster out for the upgraded speedo, but the tach problem is still there.

bad filter? or problems in the distributor, something not sending a good signal? bad ground?

[cheyenne383]

Bad ground probably, check the ground at the distributor under the cap, vibrates more with more rpms.... also could be a bad cluster/tach, if the only thing you changed was the guages, then it's probably the tach, GM tachs are inaccurate as hell and are pretty much worthless. Aparently the 350 TPI I had in my Sport coupe could rev past 6500. :kiki:

[MonteC]

no, i changed the entire guage cluster, speedo, temp, volts, fuel, and tach. so both tachs are doing the same thing.

[MrDude_1]

theres a tach filter underhood on the tach wire........

[MonteC]

Originally posted by MrDude_1
theres a tach filter underhood on the tach wire........

u know what... i think its missing... when i looked at it it looked like someone cut the wires and spiced them together but i dont remember seeing the underhood tach filter....

[CamaroGirl5.0]

There's an underhood tach filter, I looked today. I'll have to find out wtf is wrong with it. Til then I get to deal with crazy tach :tweak:

http://img219.exs.cx/img219/980/tachfilter0024ov.jpg

[MonteC]

Originally posted by MrDude_1
theres a tach filter underhood on the tach wire........

do those go bad?