This is a follow up on my previous post. It appears I may be the only person on this forum with the UMA 1B3 probe. There was a coding issue in the D-120 with this probe, but Dynon has now fixed it.
This 2-wire probe fixed my erratic oil temperature readings I had with the 1 wire standard probe. I highly recommend it. I had UMA make mine with non-standard length leads and had them use shielded wire. It makes for a very stout set of leads and simplified my installation.