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Thread: HEI & factory tach won't work with Sniper.

  1. #1

    Default HEI & factory tach won't work with Sniper.

    I have a reproduction factory tachometer & HEI. Worked well before Sniper. Made an pigtail for the HEI terminal with two outputs. One for the Sniper yellow wire and one for the factory brown tach wire. Sniper would not fire with "Stall" on the display. Disconnected the factory tach, and Sniper fired up. What can I do to get the factory tach to work? Diode inline on one or both tach leads? Thank you!

  2. #2


    You have it wired wrong. Tach lead from the HEI should go to the yellow lead in the Sniper 7-pin connector. The dark brown lead from the Sniper 10-pin connector goes to your tach. Page 16 of the installation guide.

  3. #3
    Join Date
    Dec 2009


    See pages 16 & 17: (Holley Sniper EFI Instruction Manual)
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

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