So where is that installed?  It actually looks very clever, very usable and if I were to hazard a guess, can still give readings even in the event of a loss of power.

 

It goes on the left wing, close enough for you to see, and outrside th eporp blast.

 

Thanks for the photo, I may want to do something like that myself.

 

Good.  Simple to make, but no plans available.

 

Terrence