I agree with RAP, I think it needs both. My '85 goes up the dash, and then like the roof of a house, slopes back down to the windshield, with a flat spot for the mag. compass - the back side is really useless. If I were changing it (and I probably won't), I would make more flat on top, a little more dash area, and eliminate as many humps and bumps as possible so you can mount switches, fuse panels, etc.. Maybe make the dash a little more vertical, so if you mount the fish finder in it, you can see it from the back deck better.
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 Scott, Portland, OR '85 V-20 I/O, Merc 170
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