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reading tach terminal from MSD ignition or (-) side of a coil — Parallax Forums

reading tach terminal from MSD ignition or (-) side of a coil

mg78786mg78786 Posts: 1
edited 2009-05-04 04:03 in BASIC Stamp
What do I need to do to condition the tach signal (V8 gasoline engine) -- just a standard signal that any off-the-shelf tach can read so I can read it with a BASIC Stamp?

I have a kit with the 2sx

The MSD ignition has a "tach signal" output that mimics the (-) side of a one coil, single-spark ignition system.

Thanks.

Comments

  • FORDFORD Posts: 221
    edited 2009-05-04 04:03
    that will just be a square wave 0v to +12v signal, so you should ne able to just put that straight into a stamp terminal via a·resistor in series, say·3300 ohms should be ok.

    make sure you connect the 0v of the stamp to the 0v of the vehicle (connect the negatives) or it wont work correctly.

    Then you could use the pulsin command to make a tacho quite easily.

    cheers,

    Chris, Western Australia
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