Hi Number 42
I had the same idea to make the sensors in the oil-line, but changed my mind, because I had bad experience with leaking T-pieces in tubes.
I am very pleased with the solution I found and get really good values.
BTW for me oil-pressure is far more important to know than oil temperature.
Oil is - besides air - the main cooling for these engines so for me knowing the real engine temperature is also more interesting.
I just posted my solution, maybe interesting for you too.
Analysing the Bevel Box
Scroll down ; Just the last post on that page.
But of course every body has his/her own taste

One ant does not know anything, 2000 are a super-intelligent brain. That's like this helpful forum.