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Airguide tach pegs high

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  • Airguide tach pegs high

    New to me '69 Silverline with Johnson 85hp outboard. Has an Airguide Sea Speed tach installed. At idle, it will often read ~3000rpm, and anything above idle it will jump to the high peg and stay there. I can confidently say that there's no way this motor is spinning 3K at idle, and 7K+ RPM just off idle, lol. Are there any common failure points to look at with these things?

  • #2
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    welcome aboard. most likely corrosion in your 50 year old tach.

    you can either replace it, or send it out to a speedometer repair shop and have it restored.
    1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 -

    Past Boats
    1970 Wooster Hellion - Merc 9.8
    2002 SeaRay 190BR - 5.0 - A1G2 - "Cheasheads in Paradise"
    1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

    What’s behind you doesn’t matter.Enzo Ferrari