I was wondering what kind of soldering gun do i need to solder the wires to the ECU socket? And would the solder stay?

 

I used a 40 watt soldering pen, 7 bucks.

Just crappy solder too.

Just go for it. I made a harness but fucked it up somehow, ended up just wiring right into the car and it started right up cel free. I didn't swap and wires, musta just been too close together and solder dripped or something, *shrug*

Good luck.