I have a 94 4Runner and theres about a 5 inch long crack about 1/4 of inch wide. Anything I can do to repair it?

Well its a tricky crack to fix , it will involve a flexible adhesive that is sandable you fill it and sand it till its even then repaint/dye the portion with same color it was. Color matching is difficult unless you take training on how to mix colors unless toyota has a color spray that matches exactly. Talk to a toyota parts department and ask if sprays are available.

thats like a grand canyon of dash cracks.. sheesh.. hope you can fix that. if not, send it to mark and pay him to fix it.