I have an 84 VIP I think the its a Luxura with OMC I/O 305 chevy . The gauges will not operate with ignition switch on . Turn the switch off and turn bilge pump or blowers and the gauges come as well . I think the ignition switch is wired incorrectly ? The engine will crank but has weak spark, I believe if the gauge issue resolved the spark will as well . Previous owner did alot work on the boat but was unable to make it run . Any advice 