Roughly 3 months ago I gashed my leg open, about 4 inches long and an inch deep, and it's scarred over and all, yet it still tends to hurt? Anyone know what the healing time would be on this? Could there be any nerve damage cause the random pains in it, or something else that would make it hurt still?

Could be a few things, actually.

Where exactly did you cut it?

Roughly this area vv

Could be nerve damage, could be infected. If it has been troubling you for as long as you say it has, I'd recommend going to the emergency room and getting it looked at.

Probably nerve damage. Scar tissue build up is definitely possible too.

Why not try your local GP?

Nerve dammage is my best guess... did it cut into any major blood vessels?

It's not infected, I know that for sure, from what I can tell it's healed up fine, the scare tissue is purple looking but it's starting to turn pink now, is that normal? I was thinking possible nerve damage, I don't know about the blood vessel, I didn't bleed a lot.

Yes, it's normal for your gash to turn pink within a few months.

Being that big of a gash, it's most likely nerve damage. If you are really worried about it and the pain is enough to really annoy you, I'd go to a local doctor's office or something of that sort (insta-care, etc.) just to have them check it out.

You'll probably be fine.