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ProParts Spek Speedometers are programmable, intelligent electrical gauges that use a stepper motor to drive the pointer over a 280-degree sweep on 2-1/16'' and 310-degree on 5'' speedometers. 2-1/16'' speedometers feature a Wide-Angle Dial design that creates a 15% larger viewing area (patented). High intensity LED technology and patented light distribution is designed for day or night driving. Speedometers feature programmable faceplate illumination of red, blue, green, orange, yellow, purple, or white. The dial, pointer and shift light illumination are individually adjustable. The stepper motor will return the pointer to ''0'' when power is removed. Speedometers are programmed through patented water resistant stainless steel sealed command keys located on the faceplate. No control boxes or hand-held remote control needed. Peak playback value can be retrieved, high and low alert levels set, and programmable output signal activated. Spek speedometers come with a plug receptacle for connecting the wiring harnesses. This plug and play technology significantly decreases installation time. Speedometers require the use of an electronic sending unit.