Simply put, I have a 1963 F100 with 4.6 2v (p71) swap. I have a fuel cell and am in the process of plumbing the fuel system for feed and return (NOT return less). I have read I need a tuner to delete/modify the parameters to remove the return less logic in the stock ECU. What I believe needs to be done with the tuner:

Disable return less logic
Fix pressure at 39 PSI base
Delete FPDM logic


What I found that has this capabilities:

HP Tuners MPVI4 plus the VCM Suite
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Am I missing something obvious? I have experience tuning full standalones. AEM, Microtech, and Haltech.

I don't understand the need for "Universal Credits"? Is the software not free to download after purchasing the tuner? Are there limited credits (time) I can use the software like AOL in the 90s!?!?

This is my first 4.6 engine go around. I am learning the lingo and what's available for this platform. Be gentle with me gentlemen. lol