The versatile VTAC from VMAC Racing records two high and two low readings per lap. It will display engine RPM and lap number while on the track with up to a 100 lap recall, and after the race it will recall best lap with a push of the button. Plus, the tach is lighted, so it's great for night use. Easily removed from car at the car wash or into a back up car. Works with 4, 6 or 8 cylinder engines with magnetos or standard ignitions. Comes with instructions, mounting bracket and wire loom for easy installation. Records 2 high & 2 low RPM per lap up to 100 laps. Push button recall - high RPM & best lap (the lap with your highest high RPMs & highest low RPMs) Displays RPM while racing. Use for 4, 6 & 8 cylinders, easy on-screen selection. Use for any ignition, either magneto or distributor. Use with all major brands - MSD, Mallory, Vertex, Mallory Sprint Mag, etc. For all classes of Sprint Cars, Dirt Late Models, Silver Crowns, Midgets, Modified, MiniSprints, Stock Cars. For all oval track racing, dirt or pavement.