piedraco

what does it mean when you are driving at around 2k rpm and then once you pass like 3k it starts violently bouncing up and down? does that mean its a ignition coil going bad? 89 vert 347

dimebag

stock tach? ****... i wouldnt be running a stock tach w .a stroker... id rather really know what the motor was doing.

piedraco

well i didnt want a nasty looking monster tach on my dash, i'm trying to keep a stealth appearance and nothing says hey race me than a big *** tach. eventually I would like to upgrade to some autometer gauges from florida50 but its expensive as *****, right now the stock tach that I have will have to do, so any ideas?

pro tint

they make a small digital tach that is the size of a half dolllar.

Blckstng93

Quite a few years ago (90s i think) i seen a custom dash cluster that used aftermarket black face gauges in the stock locations and using the stock dash parts. Looked really good. Wish i could remember where i saw it. Way too many magazines to go thru.

That would look stealthy. Probably lots of work tho.

5.0kidsdad

Could be your ignition system if your running a stock one i might suggest to switch to something like an msd

r.barn

I run stock tach, they're fine unless you're red lining your car on a regular basis.

Tach jumping .................
If you have an MSD box it could be doing it.
or your pick-up in the dizzy could be going out.

piedraco

im running an msd 6a with a rev limiter of 6000 and an msd ignition coil distributor is stock with an msd cap. I dont know how old the coil is...

piedraco

bump

jjw88mustang

I know I am bringing this one back from awhile ago but I am having the same problem. I also have the msd 6al, stock dizzy with a msd cap/rotor. I have an after market tach as well as the stock one still working. When I drive however both of them jump all over and the car jerks terribly. I've checked all the grounds but they all seem fine. Where should i go from there?