Which gauges? Fuel level yes, Tach kinda maybe it depends, Speedo yes, all the others no. But rather than fiddle-fking around with all that wouldn't...
You couldn't fix any of that with HP Tuners and a 'stock file', not if it's been tuner-locked, unless you were the one who locked it meaning you were...
Sure. I mean they were created for aftermarket performance applications. Straight forward, easy to use, tune, understand, and little to no emissions...
They took carburetors off production engines decades ago. Most likely the issue is that you are using a MAF only tune. So basically fix VVE and that...