need help on installing a shift light its one of those lights that comes with the big tach but im just using the light how can i set it at the rpm i want it at and its or a 93 eg..thanks

 

they use pills for different rpms...ebay it..they sell in 200rpm incriments ..you can use the msd pills also..or you can google it and find what resistance = what rpm and go to radio shark and make your own...i forgot where but i google it and found a chart a while back..