Most inst' housings provide very little space for a screw head under the circuit board. Beware of short to ground there.
Ring terminals like those used at your ALT' gauge will work for other gauges, or everything except the light circuits.
You can't use screws from your erector set the size of your fender bolts. I have done this for many years . Small brass button heads. The threads are the same ast the pin Dia. Fastenal has them.