Full automotive type lighting, no ''halo'' around dial edges., Optional add-on eyebrow or square bezels available (See Gauge Accessories for details), Scratch resistant curved glass lenses, with black, near-flush bezels, When lit, white dial grads become red, pointer lights white, Hole Size : 2.13, Ingress Protection : IP65, Operating Temperature : -40C to +70C, Operating Temperature : -40C to +70C, Sender Code: Requires ''D'', Voltage: 12 VDC