All Halo Series gauges can display 3 colors (Amber, White & Blue). The Halo Series provides fully programmable peak recall and warning feature all within the gauge. You are in control to set the warning limits where you want and have the gauge either flash or beep (Audible) or both when the gauge exceeds your pre-set limits. These gauges incorporate a red Halo ring to enhance the look with a new redesigned peak light. All Halo gauges perform both a start up and shut down ceremony and are blacked out when off. The Halo series gauges are fully dimmable with 6 stages of dimming in both day and night operation modes. All programming is done with the touch pad.