RV Repair: indicator panel circuit board, grey water tanks, indicator panel

Question
I have a 1985 Ford Tioga and one of the lines on the circuit board for the indicator panel (tells me how full my black/grey water tanks are, how full my fresh water is, LP gas level, turns on water heater, and water pump) is fried.  How do I find a replacement for a circuit board this old?  It is marked LVS 5013, but I can't find anything online that will help me.

Answer
You may not find the orginal.  try general trailer, or your local camper part store.  if not, buy an new after market one and install that.  You will need to splice the old wires to the new panel.  I have one on the wall that does the same stuff in my RV.  I know you can find something that will work and it may be cheaper.