I have a boat with a pressure water system. 12V DC drawing about 5 amps when the pump is running. It has an interesting mode that occurs when the water tanks are almost empty. The pump comes on, but because there is now some air in the lines, it can't build up enough pressure, so the motor stays running. I want an indicator light (prefer an led) that comes on when the motor is running. The pressure switch and the pump are in the same housing so I can't access the pressure switch contacts, so I can't drive an indicator that way. What I need is a cheap and dirty circuit that I can put in the panel and mount the led beside the circuit breaker so there is a visible indication when the pump is running. I don't think the pump motor is all that sensitive to voltage, so there wouldn't be a big issue if whatever is inserted in the line to sense the current (a diode?) caused a small voltage drop. Ideas?