I know that P-E offers the temperature gauge compensater but in a quick check, I didn't see it listed.
What I have found with the temperature gauge situation is that first off, the original temperature sender for the car is the Autolite brand. I can't tell you what the resistance values are for it but I can say that it is the only one that I have found that works correctly with the original Pantera gauge OR ANY Ford supplied temperature gauge.
What I think you are experiencing now with trying to find the Standard replacement for it is, there is no direct replacement.
ALL of the Standard senders will read about 25 to 30° HIGHER then the actual temperature. I've fought this battle and it is plain and simple. Standard's senders ARE WRONG and calibrated INCORRECTLY.
This has affected ALL FORD PRODUCTS completely across the Ford product line that originally used the Autolite temperature sender. THERE ARE NO EXCEPTIONS. EVERY classic "Ford" that uses a temperature GAUGE and replaces it with the Standard senders has complained about this EXACT ISSUE. PERIOD.
Apparently, to his credit, Mr.Haas recognized the issue and made a simple plug in to correct this issue. It is the simplest route to go in.
There is ONE other solution. Find a new Autolite sender and install it. It is the only correctly calibrated sender in existence that anyone can find. There is only one issue with that. They are obsolete and if you can find one new, they generally bring $100 to $150. So the "market" really knows about this already. Just some of the Pantera folks are stragglers and here and there are wandering into the situation, wondering exactly what is wrong with their cars.
It is plain and simple. Standard has just f uc ked up big time on this. They don't care now and don't want to hear about it anymore. They are not going to fix it for what they see as $15 sender. It is just "our" problem.
Go ask Jon. Get his "corrector". You will be happier and probably as a result will live longer. I'd guess that I just mis-read his product list offerings and is there somewhere?