ok. sorry if i am bothering all of the veterans on this site but every time i search for somethig i get either 0 results found or information i need but cant understand. if anyone wouldnt mind, i need a thorough breakdown on what i need for my set up. I have a stock 420a and i am just trying to run on 8 psi as a daily driver.
i have installed a t3/t4, (i know overkill), fmic, fcd, and full exhaust.
now i need to tune. i know i need a wind band o2s, and a bigger fuel pump and im not sure of injectors. when my car is cold it takes 8 psi just fine so im guesing my stock injectors are up for the task. i was wondering which version of megasquirt to purchase and where i can get the kit cheapest. also what do you guys think about fuel system upgrades? what else if anything is required to install and program?

Thank you to whoever takes the time to deal with a newb.

For 8 psi you dont need a MS at all. Run stock injectors and a 12:1 FMU. Dont make it more complicated than it need to be.

do i still need a bigger fuel pump

Yes you do.

would you need the wide band o2 as well, or can you leave that out?

If you go with MS then I HIGHLY recomend it. If you have just an FMU its a set it and forget it type thing, unless you change the disc out in it. So you don't NEED it but its nice to have.