Swap A 350 from My van to a Boat

[guentherskidsteer]

Having Trouble with the wiring . Cant seem to find the gauge Wires

[???]

pretty much everything I've messed with. the ecm doesn't do anything for gauges besides the speedo output on some. there's normally extra sensors on the engine run straight to things like coolent temp and fuel level. tach off the coil, things like that.