Nice vert! Unusual color? I like it, never seen one that color before.
My gas gauge would go wonky but not often, after a few minutes it would read ok, had to change my ignition switch for different reason and has worked fine since, I have an aftermarket temp gauge so mine is unhooked right now, don't know if your problem is related to your ignition switch, mine is an 89 gt, sn95's are different
Sorry, likely not much help there.