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PET-2100DX Tachometer "Quick Start" Manual

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  • PET-2100DX Tachometer "Quick Start" Manual

    Courtesy of Randy at Watcon Indistries, he has provided the forum with the Pet-2100DX tachometer instructions.

    Randy also sells the Pet Tachometers in his Web Store

    PET-2100 DX Tachometer The PET-2100 DX is the latest in tachometer technology. The processor updates engine RPM info 20 times per second and is accurate within 10 Rpm. The compact, lightweight casing and the clip-on inductive pickup spark plug attachment make it a snap to install and remove after testing. The tachometer will monitor engine Rpm on Two-stroke 1-4 cylinders, Four stroke 1-8 cyl, and offers compatibility with all aftermarket ignition systems. Not just a tachometer, it comes with Peak Rpm recall, Total operating time, Dual display for current and maximum Rpm and the ability to recall two maximum Rpm memories for comparison. The wide selection of modes and trouble free operation will appeal to all tuners and mechanics. No wires to install, automatic on-off operation and simple function operations make this a welcome addition to any toolbox.

    Thank you for the purchase of a Pulse Pet-2100DX digital tachometer.

    I've put together a "Quick Start" manual to help the first time user get up and running in no time.

    The whole key to the operation of this tachometer is the "MODE" button.

    To change the setting example, from 2-stroke 2 cylinder (P22:44) to 2-stroke 3 cylinder (P23:46). Press the "MODE" button until only numbers appear in the display, such as P22:42 or P23:46.

    To change to different types of motors press the "SET" button.
    You will want it to read P22:44 for 2-stroke twin cylinder, most 2-stroke 3 cylinder triples use the 23:46 mode

    21:42 = Single cylinder
    22:44 = Twin cylinder.
    23:46 = Triple cylinder.

    Using the basic tachometer

    Once you have clipped the antenna lead to a spark plug wire and brought up the correct mode required using the directions above, you are now ready to monitor running and peak rpm.

    You may also measure Rpm's by simply holding the unit near the spark plug wire.

    Remember: This tachometer is “water resistant” not completely waterproof and it is your responsibility to protect your investment. Please protect it from submersion if possible. We recommend using clear plastic “shipping tape” to attach it to your watercraft. The best method to remove tape adhesive from the face is “WD-40”, other chemicals might damage the case.

    Using the hour meter.

    This unit has a built in hour-meter for both total and temporary time. Press the mode button to display the hour-meter. You can toggle between total and temporary time by pressing the "SET" button. You can also chart the temporary time by pressing both the "MODE" and the "SET" button at the same time. This can be a very important feature for breaking in race motors or by knowing the actual running time on the motor.

    Using the Max RPM recall feature

    Once you have made a run, you can recall the maximum RPM recorded.
    Again, press the "MODE" button until a small black mark appears on the top left side of the display. The highest RPM will appear in the display. To clear this for the next run, press the "SET" button on the right side of the tach. On certain motors, when the engine is first fired, the MAX RPM may be extremely high and inaccurate, push the "SET" button to clear this out.

    Using The "TWIN MAX" RPM Feature

    You can compare both your MAX RPM from the last run and your current RPM, fide by side at the same time. Press the "MODE" button until you see Twin Displays. The left number is your MAX RPM and the right number is your current RPM. You need to take this number times 100 to obtain actual RPM. For example 80 actual is 8,000 RPM. To clear this MAX RPM, just hit the “SET” button. The dual mode will not read in 10 rpm increments and isn’t recommended for tuning purposes.

    30-Day warranty. Please save a copy of the purchase receipt for your records.

    6487 Seabeck Hwy NW, Bremerton, WA 98312
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    Last edited by RX951; 01-04-2008, 06:15 PM.
    2000 Stock GPRXP ~ 83.6 / 7900 rpm
    2006 Stock RXP ~ 67.7 mph
    2000 Stage II GP1200R ~ 76.7 / 7400 rpm (retired motor 2007 for conversion build)

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  • #2
    for fzr do i use p: 41
    2009 FZR Stock


    • #3
      P 22:44 (4 stroke 4 cylinder)
      "Insanity is doing the same thing over and over again, and expecting different results"

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      • #4
        depends on how you hook it up. If you only wrap it around one coil then p: 41 should work. If you wrap it around all 4 coils then P 22:44
        1997 Yahama GP1200- 61.7 mph(GPS)


        • #5
          I found one of these at a great price but it's missing the clip. The guy says he just ip ties the wire to The plug wire and it works fine . Will these be ok or is the lead wire cut to a certain length ? I can solder a new clip to the wire but don't want to take a chance if the by not having the clip will make the unit worthless. Thanks


          • #6
            Any length wire will work. Just wrap it around the plug wire.
            4-Tec Jetmate
            2004 MSX 1500SC
            T-45 GPRXP
            1995 785 Three Seat Triple

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            • #7
              yep. you can use regular solid core wire. I do and it works great
              1997 Yahama GP1200- 61.7 mph(GPS)


              • #8
                so on a gp1300r if i set it to 2 stroke 3 cylinder do i still only have wrap it on 1 spark lead or on all 3? thanks


                • #9
                  All three because its looking for pulses from all three cylinders
                  1997 Yahama GP1200- 61.7 mph(GPS)


                  • #10
                    I have never had to wrap all three
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                    • #11
                      yer i thought you only had to have it on one lead to. reading this thread confused me


                      • #12
                        I wrapped all 3 on '97 GP1200 and have see that advise on here quite a few times. Maybe different engines have different methods of hooking up the tach?

                        1997 Yahama GP1200- 61.7 mph(GPS)


                        • #13
                          its all about using the correct wiring

                          it is very hard to get a PET to read on a 65U... I usually put the wire on the plug boot side of #1

                          what ever it takes to get it to work
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                          • #14
                            Originally posted by saro13b
                            yer i thought you only had to have it on one lead to. reading this thread confused me
                            I hate giving bad advise. Sorry to confuse you.
                            1997 Yahama GP1200- 61.7 mph(GPS)


                            • #15
                              i have one on my gp1300r and it works at low rpms but starts playing up at high rpms and doesn't give a proper reading. I can use it to set my jetworks kit at 2500 and it works fine but out on the water at WOT you cant get a proper reading of what the engine is reving at. Don't know whats wrong with it, thinking it might be faulty