I have an 84 Camaro with the LG4 carbed motor. I just took out the tach and put in one from a later model IROC with the 5500 red line. I noticed that the IROC tach seems to be real sloppy. The motion on accelleration is not very smooth, and when I decelerate, the needle just drops in a strange way. My old tach worked just fine. What can I do to fix this? Any help would be much appreciated. Thanks.

 

sure you have all your eletric connections tight? factory tachs aren't known for being the best pieces.

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you can use your original tach and swap face plates. use a dremel tool to grind the rivets off the back then epoxy it in on. The pointer will just pull straight off, be careful, they are a bit delicate.