An idea: consider using a radioshack remote "outside temperature probe" to monitor the under hood temps. I have one on my house and got the idea as I switch over to a vented hood. The receiver could be placed anywhere inside the car, and both run on long lasting batteries.

 

i have a temp reading on my remote start alarm and when i put my scoot hood on, i will let you know what my temp differences are......

 

I've thought about doing something similar. Make sure the temperature probe reads high enough - most are designed for standard outdoor temps, not 200+ degree underhood temps!

Dale