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The instrument cluster is no longer available. However you can get a new panel made, http://www.custominstrumentpanels.com/ and your mechanic can order and install new gauges. Your gauges are generic type. You can get them in multiple colors and faces from Veethree, formerly Teleflex, http://www.v3instruments.com/Marine.html. There are other manufacturers such as FARIA, VDO etc.
This would be the most economical way to replace the dash.
As for cost it would depend on how many gauges, material, dash layout and the labor involves. Probably in the $1,000 range.
Let me know if I can help further.