MBM expansion modules available to add dual air pressure readings, boost, and compass heading readouts into odometer section. Plug directly into the MVX , MLX and MCL-3014 series gauges and add readings for up to two air suspension pressure, boost pressure, or compass heading into the existing LCD displays of the speedometer and tachometer. This makes it extremely easy to add these gauge readings without having to remove any of your existing MVX gauges.