After some experimenting I believe I have come up with a automatic switch for the IC fan. Will turn the IC fan on only if the engine is running no need to worry about battery drain or having to remember to flip a switch.

Curious if anyone is interested in this. I'm figuring price with shipping should be less than $20 (but no more the $25).

Still need to do some more testing before is compatible with everyone but that should only take a couple days if there's interest.