DESC: This universal gauge features a 6,000 rpm tach and an hour meter in one simple-to-install instrument, reducing the amount of dashboard space required for two important functions. The hour meter is built neatly into the tachometer, where it's easy to see and monitor for routine maintenance. Works with stern drives, I/O's and outboards with 4, 6, 8, 10 or 12-pole alternators. Fits standard 3-3/8" hole. Colors: Red International, Blue Vector. Gas Motor Accessories