Hey Paul,
I've looked everywhere for the extra OAT that I know I have but I've come up empty.
If it happens to magically re-appear I'll contact you.
Another option if you can wait:
Sometime in late fall or early winter I'll disassemble my plane for painting and I can let go of the OAT that I'm currently using but will no longer need. I'll be replacing it with a probe that feeds a JPI EDM 700 which will display the OAT.
Sorry to let you down.
Jim