[Richard]

Kyle nailed it pretty much.

I would add to that a high quality voltmeter with capability of measuring DC and AC amperage.
Nozzles and filters for Aquahot.

The antifreeze/coolant issue is a mess in the heavy engine world. Three or four different types of incompatible coolant chemistries, and no standardization of colors used with the specific chemistries. Try to find out what is in your engine, and put a couple of gallons on board.