Retro Style Rocket Tach Black Face With White Numerals And Red Pointer Cool Rocket Booster Changes Color As RPMs Increase! Chrome Cup & Stainless Bezel With Flat Glass Calibrated From The Factory In Your Choice Of 6 Or 8 Cylinders MSD Boxes And Other Computer Generated Signals Will Require Tach Adaptor Classic Instruments has a neat new tachometer that will blast you back in time! The Rocket Tach is a retro styled tachometer that has an added little boost to your gearhead psyche...Not only is the Rocket Tach a half-sweep gauge it also has a rocket booster that changes colors. The more you mash the gas...the rocket booster changes from light yellow to yellow to orange and finally to raging dark red! How much fun is that?! The Rocket Tach mounts like the original Sun tachs or the bracket can be removed for a cup mount application.