The Auto Meter Universal GPS Speedometer Interface Module turns any Auto Meter Electronic Speedometer into a GPS enabled speedo. No more rotating speed senders, no more driving to calibrate your speedo. With Auto Meter speedometers, it's plug and play right out of the box. The unit is totally water and dust proof and is MADE IN THE USA by Auto Meter. Using state-of-the-art GPS technology, there simply isn't a faster, more accurate GPS speedo solution available. A tiny, paintable micro antenna is included to guarantee quick and reliable signal acquisition. Better still, any speedometer that functions on a square wave signal is compatible and calibration takes about ten seconds and one button push (absolutely no driving necessary).