Observed Oil Pressure with a gauge

dts3

What was the reason for moving from the factory location to the sandwich plate?

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Two reasons:
First, I was looking for some redundancy. By re-installing the factory sensor, I had some back-up in the event that the Defi sensor/gauge ever malfunctioned. It was for ease of mind.
Second, the Defi sensor is configured such that it can't be installed using a socket (standard and/or deep). It becomes obvious why once you have it in your hand. And, I found that there wasn't enough room to tighten it into the factory port using a standard open-ended wrench. You might be able to install it using a crow-foot wrench ... but I opted instead to simply purchase an oil filter sandwich plate and install the sensor in one of the ports in the plate. I had to purchase an adapter since the female port thread was 1/8 NPT and the male sensor thread was 1/8 BSP (i.e., the Defi sensor thread is metric).

dts3

That's cool; I like the redundancy. Ideally I'd like to run a separate sandwich plate for the sensors, but with the combination of the Z1 cooler sandwich plate and the oem oil/water "cooler", I don't think I'll have enough room left for the filter (and I don't want to relocate at this point)

It's interesting that your Defi gauge is 1/8 BSP; which do you have? I have the Defi BF Advance, and the manual is saying it's 1/8 NPT.

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Well, the acronyms used for pipe threads certainly can be confusing. The install manual for my Defi Racer gauge indicated that the threads on the sensor were 1/8 PT ... which is a Japanese Industrial Standard (JIS) designation. After researching the different thread types and designations, I discovered that the 1/8 PT thread was equivalent to and interchangeable with 1/8 BSPT. So, you don't need an adapter if you intend to install the Defi sensor directly into the factory engine port since that port is 1/8 BSPT. In my case, I needed an adapter to fit the sensor into the oil filter sandwich plate since the port on the plate was 1/8 NPT (i.e., I used a 1/8 PT or BSPT male to 1/8 NPT female adapter). Trust this helps!

40 to 332

Are you sure your sensor is 1/8 NPT? I goggled the install instructions for the Defi BF Advance gaugesand it appears the sensor thread is 1/8 PT.

dts3

You are correct. I'm not sure how my brain added the N to PT. So just to summarize, PT=BSPT and not NPT?

40 to 332

Yes, evidently PT = BSPT. I goggled "What does JIS PT mean" and checked a few of the links and they indicated that PT was equivalent to BSPT.