I am not getting a reading on the gas gauge. I know this is a common problem but I was unable to find my answer on Search. I have a 53 6v all new wiring, grounded, and at least 3/4 tank of fresh gas. I once read that the unit could be placed in the tank where the float is hanging up against the side but I have not investigated that yet. What are some other reasons and corrections do I need to know before I start on this project?