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  1. #1
    Bamafanatic's Avatar
    Join Date
    Aug 2005
    Huntsville, Alabama

    How reliable are the RXP tach's?

    Are the tach's on the RXP's as reliable as the speedo And has anyone added an after market tach?


  2. #2
    Site Admin Green Hulk's Avatar
    Join Date
    Apr 2005
    Morgan City, LA
    They are extremely accurate

  3. #3
    Prohibido usuario
    Join Date
    Aug 2005
    Jerry's guest bedroom
    I asked the same question and Jerry told me they were nut on. If not I would want an aftermarket tach first thing. I watch the rpm more than anything including gps.

  4. #4
    vidbuster's Avatar
    Join Date
    Jan 2007
    Suburban Wasteland, CA
    I have yet to use a gps, but I've seen 70 come up on the display. I just got a stage I installed with Riva Washers and extension rod, it was hitting around 69 on the display. I've heard that the display is very accurate until above 65mph.

  5. #5
    Moderator The Bandit's Avatar
    Join Date
    Jul 2006
    Wilmette, IL
    Quote Originally Posted by vidbuster View Post
    . I've heard that the display is very accurate until above 65mph.
    That is a true statement. I was comparing the two, (speedo and gps) while doing 20 miles down a river at various speeds, and it was very close...+/- 1 to 3 MPH.

  6. #6
    Legend in my own mind Sirhc7897's Avatar
    Join Date
    Aug 2005
    Lake Butler, FL.
    IMO they're kind of hit or miss for the kind of modifications we're doing...The 20rpm increment tachs are better but the 50 rpm increments leave a lot to be desired...

    I ran mine against a pet tach for compare purposes with different AAT shuttles and found that is was anywhere from 20-40 rpms off and never reading the same rpms...

    This may not sound like a lot but if you're trying to dial a prop and off by 40rpms you may be giving up as much a .5mph...IMO

    For the thousands we spend in upgrades the couple hundred for a good tach seems a wise investment if you're really about squeezing every last little ounce out of it...

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