Tachometer problem @ high RPM

[knute_gis]

My tach is bouncing all around when it gets to 5000 rpm or so.

Just wanted to know if anybody else has had this problem.

thanks

[DBRODS]

Mine does that when I launch at the track, and DBTBSS's speedo doesn't work till he lets out after making a pass. IDK why

[knute_gis]

I put a new inline fuel pump in and I grounded it to the frame.

I taped up the factory harness ground wire and tucked it up out of the way. Should I ground this wire to the frame? Would this ground wire have anything to do with the tach?