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Thread: RPM Gauge Defender Puma (W terminal) on alternator

  1. #11
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    Right-o then.
    I'll solemnly clutch my bucket hat to my VB singlet, and give a wholehearted Aussie bogan apology.

    I must admit though, a good monster tach is also equally at home on a sex-spec mitsubishi lancer circa 1998, or on VT commodores doing "mainy's" all night, and driven by blokes who call themselves Dazza.
    It just so happened that I did know a few gents of middle eastern origination with such tachometers, and to their credit they were always handing me a losing timeslip on the 1/4mile.
    -Mitch
    'El Burro' 2012 Defender 90.

  2. #12
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    Nov 2020
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    Thanks guys,

    I thought it was too good info not too share.

    This is my first 4x4 and first diesel so I'm still learning and like to help others if I can.

    All the best,

    Damo

  3. #13
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    No, itís good info. Iíve looked at it in the past as a way to fit old cars with a tacho.
    Ron B.
    VK2OTC

    2004 L322 Range Rover Vogue 4.4 V8 Auto
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    Previous: 1983, 1986 RRC; 1995, 1996 P38A; 1995 Disco1; 1984 V8 County 110; Series IIA



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  4. #14
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    Apr 2019
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    Quote Originally Posted by retromatic View Post
    Thanks guys,

    I thought it was too good info not too share.

    This is my first 4x4 and first diesel so I'm still learning and like to help others if I can.

    All the best,

    Damo
    Agree, good info to share for those wanting to fit.

  5. #15
    Join Date
    Nov 2020
    Location
    Melbourne
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    Here is a better photo of the alternator regulator and it's terminals. It's the PS terminal you are after for RPM
    Quote Originally Posted by retromatic View Post
    Hi guys,

    If anyone wants to fit an RPM Gauge to your Defender Puma (2.4 in my case) but I am betting it's the same for 2.2. Here is what I did.

    I am fitting an EMS3 gauge which has RPM input also, so I figured why not use it.

    Now with diesels you don't have a true straight forward way of detecting RPM, Unless you pick this up from a crank sensor I guess. The only way is to pickup from the rotational speed of the alternator. This is your only option, and I don't know anyone else doing it via crank sensor.

    Apparently most of the older alternators have a W terminal on the back of them for the RPM Gauge. But not the Defender Puma 2.4 alternator, which is actually a Bosch alternator.

    So to add this to any alternator you need to tap into one of the windings. Fortunately the Defender alternator makes this very, very, easy.

    1. Disconnect you vehicle battery/batteries.
    2. Take the positive off the back of alternator
    3. Remove the plug fitting with two wires
    4. Remove the screws that hold the black plastic cover and take cover off.
    5. You will notice a black plastic device (regulator) BTW when an alternator starts to fail to charge 90% of time this just needs to be replaced.
    6. Take eyelet terminal (see photos) and fly wire fit it behind the screw for the alternator winding.

    Then you have yourself a W wire terminal for an RPM Gauge. In my case an EMS3, this gauge can then be calibrated to match the exact ECU reading of RPM that is taken from the crank sensor.

    Hope it helps alot of people because I couldn't find the info anywhere on the interwebs.

    All the best,

    Damo



  6. #16
    Join Date
    Jun 2008
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    The new Gold Coast, after ocean rises,Queensland
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    Quote Originally Posted by Toxic_Avenger View Post
    Right-o then.
    I'll solemnly clutch my bucket hat to my VB singlet, and give a wholehearted Aussie bogan apology.

    I must admit though, a good monster tach is also equally at home on a sex-spec mitsubishi lancer circa 1998, or on VT commodores doing "mainy's" all night, and driven by blokes who call themselves Dazza.
    It just so happened that I did know a few gents of middle eastern origination with such tachometers, and to their credit they were always handing me a losing timeslip on the 1/4mile.
    oh I get it , put a big mutha tacho in it and it goes like hell.

  7. #17
    Join Date
    Nov 2020
    Location
    Melbourne
    Posts
    16
    NO, more like install a Madman EMS3 gauge and set the RPM alarm so no one over revs it.

    If your buying a defender or any 4x4 for that matter to go fast, hmmm, I think there is something wrong. Would be like taking a cardboard box throwing it in the air and expecting it to fly like a paper plane.
    Quote Originally Posted by ramblingboy42 View Post
    oh I get it , put a big mutha tacho in it and it goes like hell.

  8. #18
    Join Date
    Jun 2008
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    The new Gold Coast, after ocean rises,Queensland
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    11,462
    ya got a flat top out of that one didn't you

    straight over your head

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