What instrument gauge is this?

Can someone identify what gauge this is on my panel? There are no units and I have no idea what the symbol is. This is on the instrument panel on 89 Seafarer.
 

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PNW_Drifter

Well-Known Member
Yamaha makes one too. I used to have one. Very handy for knowing when your impeller is wearing out. They are on ebay.
 
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