Yeah, oil cooler placement makes a world of difference.
I have one more reference point for Mitch's photo, that is waaaaay to the right when you're not paying attention and can't smell too-hot oil because everything is behind you and you've been climbing a hill for a while, so you casually shift your gaze from the scantily-clad young miss on the side of the road and look at your temp gauge - at that point it's "HOLY $#!+ !!??!!??!!??!! It's gonna seize up!" and you frantically pull over while said miss watches you as if you're a masher or something and quickly walks away.
That point is about as the needle gets into the red zone.
Michael asked: "Did you adjust the resistor (OHM) according to location of the needle you wanted? "
Yes, but I can't remember what I used. Just went under the dash with a small handful of different 1/2-watt resistors and eventually found one that put me a couple of needle-widths to the right of center with the sender sitting in boiling water. At what I consider a decent highway temp (200-205F) the needle is straight up. The thought process goes way back to the Apollo days, aircraft cockpits and most big rig trucks - in those, all the gauges are pointing the same way when "normal", either straight up or straight right so the operator can quickly see if something is amiss. Now, we have computers monitoring everything for us and then "wake us up" with a pop-up annunciator when something is "out of normal spec".
The same thought process is used with race car tachs, rotated so that the shift point is straight up, rather than the lower right quadrant. Now, most racers have a "shift light" set at the rpm's they want to shift at (although that gets confusing with dual-clutch, paddle or click shifters so many use other methods to keep the driver from blowing up the engine/transaxle.)