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Use a meter and ring through each pin. My OAT (and remote compass) in my D-10 wasn't working either. I found that I had mis-wired two pins (they were shifted one pin over). Cheers Mark

Re: D-10 and OAT problem/question - SOLVED Woo hoo ! Sure enough, I had updated the D-10 without the remote compass attached. WHen I updated the firware last night, it worked perfectly. Now, how come the remote wasn't attached? I had a wiring error on the back of the DB25 going into the back...

Thanks for the ideas ! Yes, I did update the EFIS without the remote compass attached. I'll try that first, then the rest of the ideas. Thanks again, Mark

Hi I finally got around to installing the OAT probe for my D-10 (not D-10A) in the tail of my RV-8. If anyone has been headfirst down the back of an RV-8, they'll know why it took me so long to get around to it ;) The problem is that upon power up, I am getting bizarre readings. Last night...