Choose the model Guardian speedometer 0-30 knots black 12 V Guardian speedometer 0-50 knots black 12 V Guardian speedometer 0-50 knots black w/log 12V Guardian el. sensor for speedometer/mile counter Guardian speedometer 0-30 knots white 12 V Guardian speedometer 0-30 knots white w/log 12 V Guardian speedometer 0-50 knots white 12 V Guardian speedometer 0-50 knots white w/log 12 V