Going supercharger or no supercharger is not really the deciding factor for Megasquirt or stock ECM

Mega squirt just seems to me like a stripped down version of what you need and nothing you don't. If I get a stock ECM, I am looking at trying to match up all of these wires that don't necessarily correspond to my setup being that I only care about a halfdozen sensors, ignition, and the injectors. That's it. i saw the hookup for the stock ECM and it scared the crap out of me with so many wires.

I think MS is also a fun project to learn a little about how fuel injection works, and I am intersted in the electro/computer side of trucks (possibly moreso than the axles & gears etc.)

I just want to build a setup from the ground up where by the end of it every little wire and component I will know its location and purpose. Extremely detail oriented. I am kind of excited to start digging into teh rengine harness, even though that may sound strange

You also have an extremely customizeable setup that can be tuned on the fly with optional accessories, without a computer.

I got to save up another 1500 or so for adapters and engine accessories so progress will go slow but there will be a ton of pics along the way