My gauge cluster in my 95 gt came out of a 95 cobra and I have no clue how accurate my tach is but I'm guessing not very since I run out of gas when I'm on 1/4 tank. So I'm thinking about getting a shift light and I'd like one that's pseudo discrete, I don't want a Mag Light hanging from my a pillar. Any recommendations? How accurate are they and how do they work? Also I'd like to mention that I really don't want an aftermarket tach, I'm trying to keep a stockish appearance.