Right Weigh's 510-46-B Interior Mechanical load scale is designed for a tandem axle suspension with one height control valve. After a loaded calibration at a certified ground scale, the gauge will reliably display the on-the-ground axle group weight in pounds. When properly calibrated and used, Right Weigh on-board load scales are the most valuable tool available for maintaining safe and legal axle weights. The 510-46-B has a black trim bezel, and fits in a standard 2-1/16" dash cutout. This gauge features a user-programmable 7 color LED backlight for a custom look!