How to adjust my til tof my 10

I'm not familiar with your saw, but I'm familiar with table saws in general.
The tilting is achieved by a worm screw on the end of the crank handle engaging a partial worm gear on the tilt mechanism.
If all you get is clicking, the worm is jumping out of the teeth on the worm gear. It's likely that the shaft you're turning has slid a bit in its bearing and the far end of the worm is no longer constrained and no longer holds the worm tightly against the worm gear.
I'd say just take the whole thing apart and re-assemble it. In the process, you'll find out how the worm has slipped out of place and you'll see how to put it back where it belongs so that the worm is supported on both ends.

I have no idea what an overlocker is. Help me out.

Ok, basic question...is the lock engaged? It is the small knob at the center of the adjustment wheel. Is it possible the screw has been galled?
Here is the manual- http://content.powermatic.com/manuals/1791227K_man.pdf

You can only tell by using a continuity tester or a multimeter and some troubleshooting techniques.

There should be some screws on the bottom side of the fence that allow you to make adjustments. Loosen then slightly then set the fence to 90 degrees & then tighten them.

Does wiggling the cord cause the problem?

Replace the entire switch assembly, otherwise you will be doing a lot of work and buying individual parts that very well won't be available.

align blade and fence to mitre slot.

No. Unplug saw remove saw blade grasp shaft that saw blade was on wiggle back and forth. Should not be too much play. After 10 years motor bearings are proably worn. Easy to replace

If you want to buy a new one, the Grizzly G1022 Table saw is an exact replica of the PM#63. A owners manual and parts list is available at their website. Grizzly.com