I am also planning a TDI V6 in my 23' Sceptre. Should be a fun project you have there. Let me know if you need anything VW related. Harness, Panels, misc, etc.
Do you have a inboard or i/o set up?
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1976 Seacraft CC(Pilot House) Inboard Yanmar 315
1979 Septer I/O no power Sold