Glow plugs draw a TON of amps so you can't run body power directly to them. You'll need battery power and AT LEAST a 12 gage (I think I used 10 gage) wire thru a Ford-style starter relay. DO NOT get the starter one, get the ones used for snow plow actuators - they are made for continuous duty and will hold up to the glow plugs. I got mine at Car Quest and they knew exactly what to hand me. Not too expensive. Use a TEMPORARY switch (like a starter button) inside the truck to activate the solenoid. That circuit just takes body power, no high amps. No clue why the factory actuator stuff was whining - maybe it was feeling abused?

I don't have an in-tank pump. Remember, the injection pump is fitted with a lift pump which is made to pull fuel into the injection pump. Of course, I have a front-mounted fuel tank and a VERY short fuel line but I don't think you'll need an in-tank pump. Remove the in-tank pump or it will inhibit the flow to the fuel line running up front.

The engine shuts off by applying vacuum to the shut-off fitting on the rear of the injection pump. I needed the engine to shut off any time the power was removed (track rules) and it was a stinker to make that work. There are several ways to do the shut off system but I suggest you READ my build thread on here. All of the questions you asked were addressed in detail in that thread and I think it'll be well worth your time. If you need more details you can read my build thread on BangShift.com. which has even more info than the one on here.

Dan