quick question to do with my tachometer gauge
 

my rpms are going haywire up and down to 5 000 down to 1000 the thing is my car is idling and reving perfect. The rpm gauge is all ****ed up i installed a used dizzy but the proper 1. Mayb the ignitor wires are looose or ignitor is going, i got no idea. can someone help me out

Have you tried another cluster?

i had the same problem it was the igniter.