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Yes you can check the accuracy against a known good torque wrench. That will get you close. May be within 10%. Really, for many applications, even torque is important. The ones I got calibrated when I was in the tool business, would be within 1 or 2% and were certified in case any accuracy...
The click type are most prone to going out of calibration and needing repairs. The Precision Instruments (Snap On style) aren't as accurate but they are easy to use and seem to stay in calibration longer. I believe they use a tuning fork mechanism in side.
I have seen a thread or two on A bodies. You have to find a volt gauge the same size and sweep that the original gauge is, disassemble it and put it in place of the original gauge. I will see if I can find the thread.
I have one of these in each car. It displays volts until you plug in your phone then it displays the amp draw going into your phone. I bought them on E bay.
They are adjustable with a screw through the handle. It adjusts the spring. Parts can wear and adjusting can bring it in spec at one range and it can still be out in another.
UPS stopped by today. I was after the rye but this 3 pack wasn't a whole lot more. I cracked the rye. good so far. A little oaky but that will settle down with some breathing and time. On to the American Whiskey next.