Tach issue (reading when engine off)

Discussion in 'Sport Boats' started by BuckeyePEV, Feb 25, 2021.

  1. BuckeyePEV

    BuckeyePEV New Member

    Sep 7, 2019
    1994 220 Signature Bowrider
    5.7 Mercruiser
    I noticed this on mine. When the engine is off, it shows 1,000 rpm.

    Looking at pictures online, it seems a lot of boats from the 90s have this same issue.

    Is this fixable, or is it probably faulty (which is fine)....just didn't know if there's a quick fix.
  2. QualifiedSkipper

    QualifiedSkipper New Member

    Aug 30, 2020
    300 Weekender 1989
    Twin 350 Mercruiser w/ borg warner
    it happens to mine if I turn the engine off by switching off the breaker first instead of key switch
  3. techmitch

    techmitch Well-Known Member GOLD Sponsor

    May 1, 2008
    Chesapeake Bay, Middle River/Frog Mortar Creek MD.
    1999 270 DA
    Twin 4.3s W/Alpa I Gen II's
    If it's only the tach,... it's a GM thing.
  4. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor GOLD Sponsor

    Apr 21, 2009
    How does it work with the engine ON? I'm not usually all that worried about how the tach works when the engine is off, you know? ;) You could clean the contacts (and then exercise the selector switch)... "maybe" it will help. Otherwise, it is what it is.
    Last edited: Feb 27, 2021
  5. BuckeyePEV

    BuckeyePEV New Member

    Sep 7, 2019
    1994 220 Signature Bowrider
    5.7 Mercruiser
    Actually I was reading online and I think it reads at the last RMP you shut the engine off.....if you turn key to battery only, then turn it off, it goes back to zero.

    I'm considered a rookie, so once I get back to my boat I'll see if this works......all shrink-wrapped for now.
  6. Pirate Lady

    Pirate Lady Well-Known Member

    Jun 2, 2020
    Chesapeake, Middle River
    91 250 Sundancer, gorgeous, no you can’t buy it.
    454 Bravo 1.
    It’s not a bug, it’s a feature. Serious. It’s normal. Least of your boat issues.
    BuckeyePEV likes this.
  7. Chip S

    Chip S Active Member

    Jun 17, 2019
    Bordentown, NJ
    1993 Sea Ray 200 Overnighter
    1993 Mercury 150 hp Black Max Outboard
    Mine does the exact same thing. After I turn the engine off I always turn the key back to "On" and then "Off" to drop the tachometer needle to zero. I know it doesn't matter, but it just bothers me seeing the needle at 1000 rpm.

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