Don’t a lot of aluminum engine parts like blocks and heads have thread inserts out of the factory?
Putting a helicoil in a cracked hole isn’t a good idea, but if it was welded up, what’s the big deal? I have seen 2 inch diameter helicoils.
I just adjusted mine. Very difficult to get to. I also took the front seat out, makes it much easier. I had my son hold the switch bracket with a screwdriver while I tightened the bolt.
Also made a calibration box that will work on oil, gas and temperature senders to show low medium and high ( empty, half, full) also available for loan
I used a Meter Match on mine to calibrate the aftermarket sender to the gauge. Not perfect, but works pretty good.
I also made a calibration box so you can calibrate the Meter Match without adding or removing gas from the tank. It is available for loan.
I wouldn’t think the long arm vs the short arm would be s big deal. The arm can be bent to sweep the same range.
However the non linear winding on the potentiometer that is designed to compensate for the spare tire cutout is a big deal. That can’t be adjusted out by bending the sender arm.