I wanted some opinions about what could be going on with my tach.

It seems to be delayed from the actual engine, and also has an odd sweep, not smooth, but jumpy, and will stick every once in a while.

I am not sure if this is a gauge problem, and I just need a new cluster.....or if this could be something related to the modifications done to my car....as it only started after my transplant. It DOES still read, but it is delayed for sure. I will rev it to 3 grand for example, and when it is 3/4 of the way back to idle....thats when the tach jumps to life.

Any ideas??