Hi Jesse,
I have pretty much what you describe on both white 67 and old cabrio & works well, only thing that may affect it is if you got remote oil cooler after filter? with what you describe you will measure hot oil from sump rather than what bearings will see if you are using extra cooler. I don't worry about this to much as just use temp as a guide to what is going on rather than as actual temp. I use mechanical oil pressure gauge rather than electric as its more reliable and gives better reading
cheers Richie
i have a temperature sensor on top of the oilfilter, that has worked for me for years. and yes it does measure the temp when hot, but it also is a indication of the oil getting hotter. and like Richie pointed out. these measurements are in a lot of cases just a 'gestimate' or 'educated guess'. i know what mine needs to read to be OK. i have learned it from years using the same gauge. but i would rather rely on oilpressure if i had to chose one above the other. it is electrical and the same applies, you have to learn to see what it does.
i have never fitted a mechanical one, so i can't comment on that.