I just found a replacement tps for my 05 moomba indmar tbi.
A 1994 chevy 1500 was tbi and the parts are the same, regarding the IAC TPS, and other misc parts, I am assuming the injectors as well. I am sure that indmar has remapped the computer, but in order to change the voltage map of the IAC and TPS, that would cost in my estimation to much money.
So it cost 32 dollars vs 3 times that at the boat shop. I haven't tried it yet, so PLEASE take this information with a GRAIN OF SALT.
But if you are handy with an engine and have an indmar TBI this information might come in handy.
Take care
Todd