You could go for a full STACK set up but thats seriously serioulsy expensive!
Im guessing you mean the dial backing and needles suck so u want a better look? Mayb add a boost gauge? Just have a search on the internet for sum products and find one that takes ur fancy. Most of these kits arnt too difficult to install and come with instructions, but i'd advise searching for sum celica forums, most of those places have How To's sections etc.
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