PLEASE HELP, 2010 TO 12 ENG SWAP

Living 1,050 miles from Walmart in Nome, AK and acquired a 2010 multi-race winning Rush 600, motor was grenade'd at crank. Looked at all my options, couldn't find another 2010 motor except in NY so I said f it and got me a 2012... thinking it couldn't be too hard.
Swapped from a 4 injector to a 2 injector system. New/used ECU, harness, fuel pump, injectors, everything... ect.

Now, prolly close to $3g deep, got er running, tossing a big DET code(s). Just got er' back from the shop to get the codes read... and it's astounding.

Definitely need a better harness and get it retested.

I didn't have too much time to really dig into most the issues with my mechanic, so maybe I can get ideas from your posts?

CURRENTLY (AS OF NOW)

HISTORIC (not real worried about, old owner beat the hell outta this sled and I've rebuilt it since, not to mention ECU was swapped.)

CODES:

[CURRENTLY]
P0122 TPS LOW V. (-- times)
P0117 ENG. TEMP. S. CIRCUIT LOW (1 times)
P2228 BARAMETRIC S. LOW. (3 times)
P0261 MAG CYL. PORT INJ. OPEN CIRCUIT (123 times)

[HISTORIC]
P0120, P0217, P01217, P0113, P02229, P0546, P0264, P0230, P01568, P1552, P0179.

Any input to a resolve would be greatly appreciated!!!