My bet is the turbo. ANd as ski suggested, it sounds complicated or beyond the realm of some people(like me), but screwing in a boost gauge on the intake manifold is EXTREMELY easy as the tappet is already there. Good luck!!!
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Prairie 29...Perkins 4236...Sold
Mainship Pilot 30...Yanmar 4LHA-STP...Sold
Carver 356...T-Cummins 330B
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