problem with using an IAT switch is when the WI activates the teps drop and the switch opens again do to the WI cooling.
MegaSquirt ecu can be used to turn on the WI at a set IAT, boost pressure and rmp, can also fire the HSV off a map so you have full control over waster delivery.
I`m using Megasquirt (Squirt`n`SparkExtra) for Fuel and WI control, maybe a bit overkill for what you want though.
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