To anyone who is this script i will advise to pump some liquid volatiles to fuel pipe before turn On the rocket. I f there is no liquid in the pipe, the liquid analyzer will set the temperature to 0ºK and the setting will be 100.
You also can do a little change in the code, adding this 2 lines between lines 47 and 48.

will look like this:
l r0 enginePipe Temperature
brnez r0 2
move r0 273.14
sub EngSet TTar r0

I hope will help.

Hello. Do the script work for now? I have a problem, engine pipe temperature is too high 1200+ K on start end incresing to ~3k. Then pressure blow up pipe. Help please