Hi and welcome!
You'll need to know if its a JA, JX, or JX special edition. Also, is it an 88, or, 88 1/2?
My parts book is for 1987. I did find some of the decal stripes still listed for the JX tin top. Suzuki Parts - Suzuki Car Parts Catalog Online Store
No drawing available online. My book doesn't make it clear what the decals look like either. For this particular set, there are four pieces listed. I would guess there is one for the tailgate, too.
The gas needle is most likely the sender in the tank. Very common and available from several places. Price will be between $30~ $80. I've replaced three of them and am getting faster.
Last time I looked, Suzuki had new OEM door panels, too. Not many choices left as to models and colors, but they were still available.
87 JX Stripe part #s:
You could paint, or have them cut by a graphic supply store, for less.
I painted my own.
Not original Suzuki, but I like 'em.
I can give you the part numbers for anything on an '87.
Can't help you with any of the other years.