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  •  » Rally-Pac tach

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    5/16/2013 9:30 PM  #1

    retired 65
    I FYI 24-7

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    From: nixa, mo.
    Registered: 4/02/2013
    Posts: 336

    Rally-Pac tach

    On the tach with a Rally-Pac set, does the tach pick-up like most tachs, at the coil?  I am using a MSD dist and Blaster coil in a 351W and a MSD 6A ignition box. Thanks  Retired 65

    "when I drop something, it always goes to center of the car"
     

    5/17/2013 7:04 AM  #2

    MS
    Forum Originator

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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,155

    Re: Rally-Pac tach

    The original rally pak tach is wired in series with the coil, kind of different than most aftermarket stuff.

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

    5/29/2013 3:46 PM  #3

    bullspen
    Unregistered

    Re: Rally-Pac tach

    What exactly does "in series" mean? I was just in the process of reinstalling my rally pac into my 65 mustang after having installed the painless wiring kit, and decided to verify installation process for the tach. I know that they are very sensitive and I can blow the tach, so I was trying to avoid that...Ha, Ha, Ha!!! Installing the wiring kit has currently allowed me to bypass my tach, which is great because I don't ahve to worry about my car not starting if my tach goes out, but I would like to have my tach running... Please help, thank you.
     

     

    5/29/2013 9:14 PM  #4

    Jeff in GA
    FYI Addict

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    From: San Luis Obispo, CA
    Registered: 4/01/2013
    Posts: 209

    Re: Rally-Pac tach

    It wires inline between the ignition switch and the coil. For the stock wiring, this would be between the ignition switch and the pink resistor wire.

    1965 Mustang 2+2 EFI
     

    5/30/2013 10:06 AM  #5

    bullspen
    Unregistered

    Re: Rally-Pac tach

    Is there any way to bypass having to wire it this way and still have it work properly, or do I HAVE to wire it this way. I would like to wire it so that it does not intefere with the ability of my car turning on if the tach gets fried.... Additionally, is there any way to protect (additional in-line fuse or additional resistor somewhere) the tach from being fried? I have read multiple forums where individuals fry their tachs and I prefer not to do this; ever if possible.

     

    5/30/2013 11:09 AM  #6

    Jeff in GA
    FYI Addict

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    From: San Luis Obispo, CA
    Registered: 4/01/2013
    Posts: 209

    Re: Rally-Pac tach

    Sorry, I did not notice that you are using an MSD box. I ran a factory Rally Pac with and MSD ignition for many years without a problem.You will need a tach adaptor. Verify the part number, but I believe you need p/n 8920. You can download the wiring instructions on the MSD site. It looks like your car will continue to run under this setup even if the tach fails as it reads the current from a parallel circuit. Look at the pic and it makes more sense.

    http://www.msdignition.com/WorkArea/DownloadAsset.aspx?id=15032386438



    (edit) It doesn't look like my link is working. Try pasting this link in your browser:

    http://www.msdignition.com/WorkArea/DownloadAsset.aspx?id=15032386438

    Last edited by Jeff in GA (5/30/2013 11:11 AM)

    1965 Mustang 2+2 EFI
     

     

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