Hi Guys, I was hoping somebody else has had this problem,and that maybe I just made a simple error during installation. I've got an old Sun tach with the narrow sweep dial (160 degrees or so?).I will post some pictures of it later today to show exactly which model it is. Anyway,the problem is,it will read nice and accurate at idle,and it will read up to 3000 rpm,then it just kind of goes into spasms after it gets to 3 grand.....the needle will not go over three grand unless its just in quick twitches. It did this when I still had the Accel points distributor,and its doing it now with theMSD stuff too. I bought the MSD tach adaptor kit,but have not installed it yet,because I think its definitely a problem with the tach. It's in really nice shape visually,but this problem is driving me nuts,as I need to get the car working properly for the Meltdown! Any thoughts,advice,related experience,or assistance would really help me out at this point. Thanks a bunch, Scott Posted using two Dixie cups and a medium length piece of string.