Stu, thanks for referring me to the early info. I had it buried somewhere and didn’t want to dig it up when responding. You’ll notice that my recommended voltages are slightly higher than those calculated from resistance.
I found that the voltages calculated from resistance measurements were providing lower than normal gauge readings. I have some theories about why. But none the less, I reversed the procedure. I measured the actual voltage required to get repeatable measurements on a a bunch of used gauges. It was amazing how consistent the gauges were with the same voltage inputs….despite how ugly they looked. The gauges really are quite rugged. I use an HP voltage and current regulated power supply. When measuring voltage to two decimal places it is important to note where the actual voltage is measured. It certainly isn’t measured at the source. I measured on the threaded round nuts of the gauges to eliminate lead and termination voltage drop.