Yeah, on the gauge itself, there are three connections, one is already grounded...The other is not a ground that I would assume goes to the switch and third connection is the copper oil line...
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1971 Tartan 34C Sloop "NOVA LUNA", Rebuilt (2019) Fresh Water Cooled A4 (Bought boat in 2014)
1968 Tartan 27 Yawl "Destinada", rebuilt Old Lyme freshwater A4 (Sold boat in 2014)
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