Bought this for the CBF which has no coolant temperature gauge then realized it works fine as an external gauge for ambient. 
https://www.amazon.com/gp/product/B002B0KVFQ/ref=od_aui_detailpages00?ie=UTF8&psc=1
works the charm
Thought there was a thread on this but could not find it.


https://www.amazon.com/gp/product/B002B0KVFQ/ref=od_aui_detailpages00?ie=UTF8&psc=1
works the charm
Has a selector switch in the back to switch from F to C Celsius scale
Digital Display -40F to +160F ( -30C to +70C) (Fahrenheit to Celcius Selector Switch on back)
Remote wired probe can read temperature up to 8 feet away
Designed to be flush mounted or can be surface mounted
Battery Operated (included) (Aprox 2 year battery life)Size 1"x1.75"
Thought there was a thread on this but could not find it.