How do I install an aftermarket tachometer or shift light?
The short answer to this question is that you will need a tach adapter, which needs to be wired into the coil packs. You can find more information (including part #’s and instructions) here, thanks to Silver03Snake: http://www.svtperformance.com/forums/showthread.php?s=&threadid=21505 In addition, if you are just looking for a shift light, there is one available that works without a tach adapter.