Quick wiring question regarding an OmniPro II when using an Auxiliary Power Supply and External Relays. I am adding an Altronix Power Supply to my set-up to power a large number of sensors. Power comes from the Altronix Unit for these Sensors. Do I still utilize the ground terminals found on the main panel for the grounds for all sensors or do I tie the negative ends in somewhere else? I am wondering because if the board is not set-up to handle the power requirements of these items, is it set-up to handle the back end of the circuit (negative)?