my tach all of a sudden doesn't want to go past 6500 rpm....now my car hesitates at anything over 7000...and when i try to wire my shiftlight the tach goes completely dead...and i also hear my engine/alternator through my speakers...anyone with any ideas on these all help is greatly appreciated....this is on a ls with 404's and a chipped ecu..the car used to rev fine past 8 grand now it is doing this..thanks again for your help...

 

top....really need help

 

Bad ground.

 

thanks for answering.......what would make my ground go bad all of a sudden? nothing looks corroded or anything..