AA Livorsi - 3-3/8"or 4-5/8 Mega or Race Series GPS Speedometer Gauge OnlyGPS satellite guided analog speedometer Provides accuracy with no needle bounce No pitot tube needed Memory recall retains highest speed Accurate readings on stepped or ventilated bottoms Connects to the output of some GPS antenna receivers Choose gauge only or full kit Kits include speedometer, memory recall and harness Available in 3 3 8" or 4 5 8" cutouts Black, white, platinum or carbon fiber dials Choose from nine rim colors NOTE: Required DCH