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I am using the Micro Vision EPI 800 system
To get the least ram air effect, as far away as possible from the exhaust and in the shade, I have mounted my OAT probe through the aft spar about midway in the wheel well and aft into the flap enclosure. That position seems to give a very close indication of the actual OAT, - even on ground.
With an IO-engine I have no use for the CAT probe to measure Carburetor Air Temperature.
Instead I have cut the lead at the firewall, mounted a socket on the forward side of the firewall and a plug on the remaining lead with the probe. During my test flights I placed the probe different places in the engine compartment to get an idea of the temperatures and the efficiency of my baffling. Temperatures in the upper aft accessory compartment were generally 25-30 dg C above the OAT, - not boiling at all.
Jens  - flying out of Copenhagen

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