The only gear that works is 2 I have it tore apart and the only way to get that gear to work is to squeeze the wiring and the push button at the same time.

Most likely the wire between the button and the overdrive solenoid is apart, or insulation off so it is grounding, or bad connections at switch, or at solinoid. Or power supply to the switch is bad or connection loose, or possible the switch itself is bad.

hard to change gears is a clutch problem mainly so make sure that the clutch is operating properly ( makes no difference if hydraulic or cable)
Drain out the oil from the drain plug on the bottom of the box. clean the magnet on the plug. check for metal bits as this indicates bearings or gear problems. Replace the plug. About half way up the side of the box you will find another plug. Remove it. The oil you are using should be to makers specs but I prefer a 80-90 epw gear oil as the gears do a lot of work and need that extra tension in the oil to keep the teeth apart. Some makers recommend 30 grade straight mineral oil (not engine oil) but use what is recommended. You get the gear oil in 1ltre bottles ( pint or quart) and they now have an extendible plastic hose that you pull out. Put that in the plug hole and squeeze the bottle. Will probably use 2 and 1 half bottles depending on the box. Squeeze in oil until it flows back out the fill hole. Let it level out as that is the correct level of oil for the box. refit the plug tight

You may have damaged the instrument cluster. The PCM has to receive a code from the instrument panel to start. Its part of the security system. Beyond checking fuses you are going to have to take it to a qualified mechanic with the proper diagnostic equipment. It sounds like you wired something incorrectly

The gears inside the mechanism are going out before long it won't open or close the lock, does it make a weird motor noise every time you try to? I tore one apart hoping I could just turn the stripped gears inside 180 degrees and it would work for a while longer but only found out they don't work like that and will require a new mechanism.

Take the casing apart, make sure the spring is intact. This is activated when you turn the ignition key so make sure all wires are in good shape. While apart, determine the key is doing what it needs to unlock the shifter. You will see the mechanism. If it works fine, be sure nothing is impeding the shifter. You can also, with your finger, push the pin to shift gears. In some cars, you can break it off and never have to worry about it again. The danger there is that it can go into gear any time.

Start the engine, depress the brake pedal, press the oval push button attached to the upper side of the gear lever stick and shift the lever to R, N, or D. It should work. If not check the following:
- Push button mechanism and the solenoid for malfunction.
- Brake switch assembly.
- Wiring harness.
You can also release the gear lever by pressing the small red button located on the base of gear lever stick. Simultaneously press the small red button and the push button of the gear lever stick to get it out from P.

Sounds like a broken wire at the harness where you squeezed. The broken wire is inside the insulation within the rubber protective tube. Must take it apart and rejoin with solder or a new section of wire.

detemp ball/button could be broke check the brake linkage/switch to the trans if not any of those block the tires start it and have someone get in and hold the brake then get under it and see if you can move the linkage.

Well the fuse could be the problem but I would doubt that.. Is the button itself dirty in any way? Sometimes the manufactuer just make faulty parts. Has it always done that? Is it just sticking? Can you hear plastic grinding when you force it? I believe it's a problem with the switch itself. Not the operational system of the vehicle...

Take the gear shifter apart an lube it . key graphite .