Sandwich plates will likely differ, so the ~50deg too high reading I got probably won’t be the same for another. 50 is just a guess. I was doing a lot of temp and pressure experiments back then. Altho I had 2 temp sensors in the sandwich, I did not have them anywhere else during that experiment so I don’t know for certain what the temp was in the oil pan, or anywhere else, at the same time. Also, I went off scale on my gauge. So maybe 50-70deg too high is a better #. You should try it tho. Get another datapoint. Maybe something crazy was going on when I did it.
RE putting temp sensor at oil level sensor locaiton. The oil level in the pan varies wildly. It would not be easy to rig something up such that the sensor ended up <1" from the bottom of the pan.
If you want 2 oil pressure sensors, or maybe a sensor and a switch, then you will need to use a manifold. You won’t want to use the OEM pressure switch because it’s 12mm and you manifold will be 1/8NPT. If you want separate sensors, just buy a little 1/8NPT manifold, common at places that sell nitrous parts, and then plumb it to the block with a short length of SS hose and adapters. Use a -4 AN hose because AN fittings are far more tolerant of disassembly/reassembly then NPT.
Chuck’s -4 is a reference to hose dia. Look up AN hose and fittings.
For clarity, no you don’t need the OEM oil pressure switch. The smart thing to do with it is to turn it into a coolant pressure switch. To do this, remove the 2 small hoses at the throttlebody. Plug one at the thermostat body. Follow the other to the block. It goes into the block near the starter. With some liquid wrench and a breakerbar or big impact wrench, remove the hosebarb from the block. A 24mm deep socket will do.
Then thread your OEM oil pressure switch into the block. It’s a 7psi switch. Reusing it’s connector, wire it to a great big warning light on your dash. Needs to be big and bright and right in your face. The kind of thing that will stab your retinas out.
I know this thread has been mostly about oil temp, but IMO the important thing is oil and coolant pressure. Then coolant temp and last, oil temp.
A final note. I’ve gone thru a lot of gauges and sensors. There was a time when I had 4 oil temp sensors, 4 oil pressure sensors, and 2 oil pressure switches. It was kinda crazy but I was curious about everything and playing around with the car at night was my hobby. One thing I learned is that the most elegant way to do gauges is to get the high end ones like Stack and Autometer that have programmable colors and a data-out for a datalogger. They are more accurate then normal electric gauges, you don’t need to add switches because the programmable backlight colors will get your attention as long as you place the gauge in your face, and the data-out is by far the best way to get gauge info to a datalogger, at least that’s the case for Traqmate.