VDO GPS Speed Sender, Adds GPS Accuracy to VDO Electronic Speedometers. Features: Green, Orange, Red status LED; 6ft (2m) shielded cable; Compatible with allThis sender transmits 16,000 or 200,000 pulses per mile driven (depending on your wiring preference in step #2). When used with a VDO speedometer (purchased. These instructions describe the installation, wiring, cali- bration and operation of all VDO Programmable Speedom- eters with LCD display. General Information.