ok, so i have bought a used boat and motor. this rig is nearly 20 years old but has been taken pretty good care of. i have no idea how many hours are on this motor. i'll be taking it on some 10 to 20 mile trips on the mississippi river. any ideas on the kind of problems that could strand me somewhere and what spare parts would i be smart to carry on the boat on these long trips that might keep me from getting stranded. i'm installing a remote fuel filter/water seperator. replacing all the fuel lines from the tank to the motor. replacing the lines from the remote oil tank to the motor and changing the gearlube in the foot. basically, i'm worried mostly about the electronics on the engine failing. any electronic parts that are simply plug in and go parts that a novice could service if they failed on the water? any ideas would be appreciated.