Can '64 Dart Temp Gauge Be Adjusted?

I adjusted the dash gages, both temperature and fuel, when I had the cluster out in my 64 and 65 A's. I posted w/ photos. Don't ASSume your IVR is bad. It is easy to measure its output voltage on the rear of the dash (large V-shaped copper terminal a fuel gage output bolt slides into). Should be 5 V. Instead, I put an adjustable "voltage limiter" on both clusters. One I bought off ebay for $30, marketed for Mopars. Next pass, I couldn't find it and didn't want to pay $50 for the RTE one. I found a generic Vreg which looked just like the $30 one for ~$7 on Amazon (recall). Works fine. Adjustable is best since that gives you another "knob" to adjust. I had adjust the voltage and add parallel resistors (~20 ohm to rear of cluster) to get the fuel gage to read correct w/ my new sender. That was all the "knobs", but the gages themselves have 2 screwdriver adjustments, so I used those for the temperature gage. One rotates the needle (to set zero?) and the other changes the pivot point (to set gain?). They actually bend the metal, so don't fuss constantly or they will break. Not in the shop manual, so I suspect just something the gage manufacturers did in final inspection. BTW, the only advantage with the RTE IVR I think is that it gives a higher voltage initially after key on, to move the gage needle faster towards center. The OE thermo-mechanical one did that, but perhaps not purposeful so likely no reason to design for that.