Outside Air Temp Thermometer

[unipres]

So the factory outside air temp has been removed from my PA-28 and previous owner had a little electronic device the was drilled into a side window that has failed. I currently have no outside temp gauge which begs a few questions:

• For IFR flight, am I required to have a "certified" temperature gauge?
  • If so, which one and where can I get it?
  • If not, what's a good simple and affordable gauge to use?

Thank You!

 

[reb]

 

[flyguydon]

 

[Orest @ CYFD]

 

[Pa32guy]

 

[Domenick]