It will run on the high pressure pump alone if there is enough fuel in the tank. I actually have one doing that right now, the in tank pump shorted out so bad it smoked the wiring.
The later trucks did away with the 2 pump setup and went to a...
The second pump is the true pressure pump, the ones in the tank are low pressure transfer pumps. If the high pressue pump has failed, you will have troubles as it needs the pressure to get proper spray as well as simple delivery. The regulator is...
Kind of, just goes from the firewall to where it needs to. It doesn't break into smaller areas. The vacuum only controls where it blows and the temperature it blows at. Wiring is responsible for blower speed. By 06 not even sure they were using...
Gauges are definitely a good add. I would recommend a voltage gauge as well. That trailer should be a breeze to haul, hardly any weight to it. I have hauled cars with my 88 without much effort. Bigger hills and grades are noticeable, but not...