New member with old gauge problem

If you do have a NOS gauge, by all means go ahead and install it as is. You don't need any ones aftermarket limiter. The NOS mechinal limiter will work better and can work flawlessly for many years. Neither of us need to argue that "bend the little thingy" bullchit.
THE ONE THING that could help is insight. I can provide that... NEVER TAP ON THE GLASS. Four instruments are placed behind this one lens. A conductive metal matting frame and the lens are held to the bezel with a few plastic "melt stakes". Owners who have 1 or more questionable instrument responses tap on the lens, melt stakes break, major instrument damage occurs. Why ? The ALT' gauge is full unfused 12 volts all the way to its needle. this fuel gauge with limiter inside is supplying a path to ground. A minimal, the needles get bent, loose small bits of paint and likely wrecked in their pivot points. worst is sparks fly. The needle in the fuel gauge turns red and disappears. That tiny aluminum needle doesn't stand a chance with this much current passing through it.
Next is the connector on the oil pressure sender. Most likely that there is no insulator on that wire terminal. If it should get shorted to ground ( happens far too often, especially where distributor wrench comes to visit ) the mechanical limiter would send excess voltage through all the gauges.
As for the TEMP' sender wire getting pinched under a rocker cover or otherwise shorted to alternator wiring,,, this sort of chit happened, just much less often than the for mentioned errors.
Bottom line, you have a new limiter. Do what you can to ensure its happy life in your otherwise old vehicle.