I would take the dash panel out, cut a new trim ring for the rear of the panel out of ABS plastic then glue it into place. I just redid my 180 BR dash panel with new paint and gauges and had to do this for the trim gauge location.
Black ABS plastic is cheap and cuts easily with a Dremel Tool or Rotozip.
2000 180 Bowrider, 135hp 3.0L Merc, 2.00 Alpha One Gen 2 OD, 14.5 x 19P prop
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2000 180 Bowrider, 135hp 3.0L Merc, 2.00 Alpha One Gen 2 OD, 14.5 x 19P prop
Regular weekender, trailer stored indoors, Southern Ohio