[K Sykes]

Have done a lot of clean up of CIS related parts and wiring off of my engine now that I am on EFI. Thinking about using one of the no longer used sensor holes/sensors to get oil temp to use for the EFI ECU. Going from left to right, I have the thermotime switch, oil temp and pressure that feed the gauges and a fourth sensor all the way to the right that I don't know what it's for other than it doesn't do anything in my current set up (nor does the thermotime). What I was thinking of doing was using the left most sensor (assuming it's reading temp) or using one of the two threaded holes to for the thermotime or the one on the right to use as a temp sensor. I am the Tbitz sensor on a chain cover bolt which works fine, but was looking for something that was measuring the oil itself.

So two questions;
1. Can someone tell me what that right most sensor is/does?
2. Is the threading on either of those holes the same as a standard temp sensor?