alright heres the scoop. for a month my tach has been jumpy. today i replaced the external ignition coil. it seem fixed until i passed 3000rpms. jumpy, again. my alternator and distributor is a yr old. what else could it be thats making it do that? heres a vid of it,
http://www.youtube.com/watch?v=4g_gUvfa9DI