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Thank you all for the responses. Can anyone give me a part or model number for the guages that would be best for an optimax? Seriously considering tackling the job myself. I always am excited to learn new things.
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Mercury 3L/4 Stroke/Verado Moderator
881834A1 is the "correct" gauge set for checking pressures. According to Mercury, you would also need a high-speed USB pressure transducer and Computer Program to precisely set the pressures. I have their tool for this... and will say to "pass" on that one.
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Thank you for the response. I will take your advice.