Running pre IAT is not a fail safe.
The only way to have a fail safe is to run separate fuel maps and wire in a hobbs switch so that as soon as pressure is lost in the line then it drops you down to the low octane table.
Either way, link is very involved. I highly recommend you activate the meth via link. It can be done other ways but not anywhere as easy to tune for as link won't know about the added fuel.
Agreed, this is the only real failsafe there is with a meth kit. Low level sensors and blinky lights are probably as good as my check engine knock light. Any real catastrophic damage will already be done by the time your warning lights come on
On a side note I spray 2 x M14's driectly onto the IAT, never had any issues here and the 100% meth does not degrade the sensor either. I have been doing this for a few years now.
My fail safe is to simply have a meth system that just does not fail
Works well for me.
