QuickCar Racing Digital Open Wheel Gauge Panels feature an ultra-lightweight design. They are fitted with 2-1/16" diameter digital electronic gauges. These high quality digital gauges feature a digital, blue LED readout and graduated scale for increased readability. They also utilize built-in warning light functions, pre-set with the touch of a finger. The driver is instantly notified by flash lighting in the event of a problem. Weather resistant panels use a 12-volt battery for power, or for traditional sprint cars that lack a battery and require a self-contained panel. The self-contained unit uses a compact, 12-volt rechargeable battery for power and includes a double-pole switch that functions as both a kill switch and as a means of activating the gauge panel. Self-contained panel includes a battery and charger.