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Thread: E-38 Tach output

  1. #1
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    Apr 2007
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    Default E-38 Tach output

    Hey Guys,

    So, I am working on a customers sprint car that we have an E-38 in and I would like to get a Autometer tach working. Problem is, what do I tell the computer to get the correct output signal.

    Thanks for any help at all,

  2. #2
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    Oct 2008
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    may be too late. the tach setup should be set for crank and high and low pulses set to 15. the autometer tach should be set for 4 cyl mode. we had to put a pull up resistor in the signal wire also. you may not. we have a e38 with an ls3

  3. #3
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    Thanks,
    I will have to give this a try when the car comes back in. What type of resistor did you use and what did you pull it up to, 12 or 5 volts?
    Thanks,

  4. #4
    Senior Member doubledip's Avatar
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    May 2008
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    680ohm resistor between the 12v ignition wire and the tacho input wire which basically jumps a 5v signal upto 9v and there you go a tach signal

    try that

  5. #5
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    Worked Great, I actually only had 1.2k ohm resistors, so I paralleled 2 of them and soldered in and everything worked. Thanks for the info and help.

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