I purchased a GX Tank 140 along with 4 Safiery Ultrasonic Tank Sensors. The sensors require 12v, and my question is twofold. First,I have a 5th wheel with a victron multiplus and 4 lithium batteries and monitor with a CCGX. Can I connect my Tank 140 to my RV 12v system, and how do I regulate the four sensor inputs to all be 12v? As I understand the setup, inputs 1 and 2 require an external 12v power supply (can I use battery?) and inputs 3/4 are 24v and that is supplied internally from the Tank 140 (as I understand it).