Ideally a cylinder leakage test would be the most accurate test for cylinder integrity. Justtrollin's method is a good indication of a head/gasket problem. When you pull the plugs out you can bring each cylinder to top dead centre and visually inspect the top of the piston. The pistons will have carbon on them. If you have coolant leaking into the cylinder the top of the piston will be clean instead of carboned up. Also you can drain the oil from the engine and see if any water comes out. It will come out before the oil.
Without getting into the particulars of electricity. If it is recommended to run 4awg wire, then that is what you need to run. Running a thinner wire will cause the motors lifespan to be shortened as well there are other shortcomings as well.
Very nice Fishsniffer.
You do know that GLF is only going to use it to get a reserved parking spot.
On a serious note: It is nice to see the GLF tournaments growing in size.
You could look for an early 1980,s fuel injected vehicle that used an "Idle speed stepper motor". They will work off of 12 volts DC. Some later model vehicles used this as well. Instead of a reostat you could use a potentiometer. Automotive application: TPS-throttle position sensor. They are a 3 wire sensor.