I'm wanting to run a relay between my zener diode and the map signal wire.
I'd like to use a pressure switch in the alky injection line to activate the relay so if I run out of alky or the pump dies, the relay will open and break the connection to the zener diode. Hopefully if this works, a loss of pressure in the alky system will cause the stock cutout to come into effect and save the engine. The problem I'm having now is trying to decide what to use for the pressure switch. I have a low pressure cutout switch out of an old set of air conditioner lines. I'd like to use that, but I don't know how well it would react to the alky (methanol).
Any thoughts?
Thanks,