Running a Auto meter tach off of a Magneto
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Running a Auto meter tach off of a Magneto

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    Senior Member capnfyr's Avatar
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    Default Running a Auto meter tach off of a Magneto

    I have a question for the wizards. I have a magneto on my pro stock boat engine with an internal coil. Can I run an electronic type of tachometer (Autometer) off of the mag with the internal coil or do I need a mag with an external coil to make it work? There is only the kill wire coming out of the magneto. Would this wire give me a signal for the tach?
    Any help would be appreciated.
    Thanks in advance.
    Paul
    Capnfyr
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    Senior Member jockorace's Avatar
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    Paul, here is a pic of what you need. Small converter box for a mag. I've only used them on Vertex style mags, so may want to check with AutoMeter before buying one. Jocko
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    Senior Member capnfyr's Avatar
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    Thanks Jocko, I will give them a call.
    Capnfyr
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    Senior Member capnfyr's Avatar
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    I checked on the tach adapter and they state that they are for external coil type magnetos. There is a device called a"Tach drive pulse signal generator" that may work off the V drive or off the cable dive off of the magneto.
    Thanks for all the help
    Paul
    Capnfyr
    1984 Daytona Sprint. AKA "Pyro Flyer" 2016 APBA High Points GPS 95 Champion.
    GN 8 AKA "Tinman" Under Construction. Back on the water for 2018.
    21' Eliminator Sport V Drive Lake Cruiser


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    Senior Member propless's Avatar
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    Quote Originally Posted by capnfyr View Post
    I checked on the tach adapter and they state that they are for external coil type magnetos. There is a device called a"Tach drive pulse signal generator" that may work off the V drive or off the cable dive off of the magneto.
    Thanks for all the help
    Paul
    Must have changed them because they use to work with both types of mags.
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    Default Discontinued Autometer mag tach

    At one time Autometer sold a 10K tach designed for the Vertex type magnito, and they had a memory... There are still some out there, likely laying on the shelve of someone that went to a more modern type ignition, or an external coil type mag... I know I have an extra one, but sadly, it isn't for sale.... Check an old Jeg's or Summit catalog for the number and then start asking around. And yes, the tach signal comes from the one wire that is also the "kill" wire to ground....

    Ray
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    Senior Member capnfyr's Avatar
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    Ray, thanks for the info on the older type of tach that runs off of the kill wire. I thought that they were around some time ago. I will try and locate the partnumber and put out some feelers to see if someone just happens to have on as you say " sitting on the shelf".

    Thanks again

    Paul
    Capnfyr
    1984 Daytona Sprint. AKA "Pyro Flyer" 2016 APBA High Points GPS 95 Champion.
    GN 8 AKA "Tinman" Under Construction. Back on the water for 2018.
    21' Eliminator Sport V Drive Lake Cruiser


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    Senior Member orngxtc's Avatar
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    Sorry if the link doesn't work. Joe Hunt has a magneto converter listed for use with ALL there magnetos. It can be found under accessories.
    Joe Hunt Tach Signal Converter - Joe Hunt Magnetos
    Hope that was what you wee looking for.
    John

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    Senior Member jockorace's Avatar
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    Quote Originally Posted by capnfyr View Post
    Ray, thanks for the info on the older type of tach that runs off of the kill wire. I thought that they were around some time ago. I will try and locate the partnumber and put out some feelers to see if someone just happens to have on as you say " sitting on the shelf".

    Thanks again

    Paul
    Ray is right on that AutoMeter tach specifically made for a mag. I had one that went ON/OFF of the shelf for several years as I went thru the boats of my life, lol! Finally, an Australian guy convinced me he REALLY needed it more than me.....so off it went. Wish I had it back now!
    Jocko

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    Senior Member capnfyr's Avatar
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    Thanks for the link John. I will check it out and see if that will work for my application.

    Paul
    Capnfyr
    1984 Daytona Sprint. AKA "Pyro Flyer" 2016 APBA High Points GPS 95 Champion.
    GN 8 AKA "Tinman" Under Construction. Back on the water for 2018.
    21' Eliminator Sport V Drive Lake Cruiser


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    Senior Member Hass828's Avatar
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    ETC Rev Limiters offers his magneto limiter with a tach signal converter built in.
    ETC Rev Limiters
    "if we keep doing it the same way we always do..we will always get the same results"
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    Senior Member Hass828's Avatar
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    OR
    if you have a flying magnet -- you can use an MSD 2348 hall effect sensor on it and generate a tach signal that is completely independent from the magneto. This is what I do because I run a datalogger and it doesnt play nice with the mag.
    Heres a little test I did with the hall effect
    "if we keep doing it the same way we always do..we will always get the same results"
    H8-2-W8
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    Senior Member capnfyr's Avatar
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    Way cool!! Now I have a couple of options.
    Thanks for all the help

    Paul
    Capnfyr
    1984 Daytona Sprint. AKA "Pyro Flyer" 2016 APBA High Points GPS 95 Champion.
    GN 8 AKA "Tinman" Under Construction. Back on the water for 2018.
    21' Eliminator Sport V Drive Lake Cruiser


    [SIGPIC]

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