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Thread: Holley Digital Dash Tach Issues

  1. #11
    Join Date
    Dec 2009
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    Connecticut
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    A little more information would be nice. Name brand, cost, size, wiring, or even a picture.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385"/6.3L SBF, Dart SHP 8.2 block, forged steel crank & rods, forged pistons, Trick Flow T/W 11R 205 CNC comp ported heads, 12:1 comp ratio, 232°-244° duration/.623" lift/114° LSA camshaft, TFS R-Series FTI comp ported intake, BBK 80mm T/B, Holley Dominator MPFI & DIS, Holley 36-1 crank trigger, MSD 1x cam sync, PA PMGR starter, PA 200A 3G alternator, Optima Red battery, 100HP progressive dry direct-port NOS, R134a A/C, Spal dual 12" fans, Frostbite 3-core aluminum radiator, Pypes dual 2.5" exhaust, off-road X-pipe, shorty headers, Earl's -6AN fuel system plumbing, Walbro 255 LPH in-tank pump & Pro-M -6AN hanger, S&W subframe connectors, BMR upper & lower torque box reinforcements, LenTech Strip Terminator wide-ratio AOD, 3000 RPM C6 converter, B&M Hammer shifter, Stifflers transmission crossmember & driveshaft safety loop, FPP aluminum driveshaft, FPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 M/T Street Comp tires.

  2. #12

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    Quote Originally Posted by 1fast10 View Post
    Bringing this back from the dead. We have found no fix for this car. It does go away if we unhook the 1-wire alternator. Install a brand new alternator, same issues. No alternator, no problems. We even have a MSD noise filter on the main power feeding the Digital Dash & MSD Power Grid.
    I have the same issue, but I'm using Big Stuff 3. When the alternator is unplugged, all the noise goes away and tach signal returns to normal. Tries multiple alternators. I haven't found a fix.

  3. #13

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    Quote Originally Posted by Stang986 View Post
    I was told by Holley they have a fix for it. It's some type of harness, when I called them about this problem.
    The part number for this is 554-131, it's a input conditioner that filters some of the noise from the tach input. It's meant for tach inputs only, DO NOT use it with a coil (−), it won't work for that.

  4. #14
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    Dec 2009
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    Connecticut
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    http://documents.holley.com/199r11587.pdf (Holley 554-131 Digital Dash Tach Input Conditioner)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385"/6.3L SBF, Dart SHP 8.2 block, forged steel crank & rods, forged pistons, Trick Flow T/W 11R 205 CNC comp ported heads, 12:1 comp ratio, 232°-244° duration/.623" lift/114° LSA camshaft, TFS R-Series FTI comp ported intake, BBK 80mm T/B, Holley Dominator MPFI & DIS, Holley 36-1 crank trigger, MSD 1x cam sync, PA PMGR starter, PA 200A 3G alternator, Optima Red battery, 100HP progressive dry direct-port NOS, R134a A/C, Spal dual 12" fans, Frostbite 3-core aluminum radiator, Pypes dual 2.5" exhaust, off-road X-pipe, shorty headers, Earl's -6AN fuel system plumbing, Walbro 255 LPH in-tank pump & Pro-M -6AN hanger, S&W subframe connectors, BMR upper & lower torque box reinforcements, LenTech Strip Terminator wide-ratio AOD, 3000 RPM C6 converter, B&M Hammer shifter, Stifflers transmission crossmember & driveshaft safety loop, FPP aluminum driveshaft, FPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 M/T Street Comp tires.

  5. #15

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    Based on the I/O Adapter configuration instructions: http://documents.holley.com/199r11021.pdf, it states:
    Pin B5 is to be used with a tach output or similar signal. The Black/White wire at pin 19 must be connected to
    a battery or chassis ground for the RPM and gauge signals to operate properly
    .
    I'm guessing using the Tach Input Conditioner, you still have to run the separate ground as well. I don't know if I will need it yet, just trying to plan in advance just in case, because I've already ran out of ground ports on the connector and having to stack grounds with the pin 19 chassis/battery ground.

  6. #16
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    31,121

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    Yes, the Holley 554-131 Digital Dash Tach Input Conditioner has its own ground too.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385"/6.3L SBF, Dart SHP 8.2 block, forged steel crank & rods, forged pistons, Trick Flow T/W 11R 205 CNC comp ported heads, 12:1 comp ratio, 232°-244° duration/.623" lift/114° LSA camshaft, TFS R-Series FTI comp ported intake, BBK 80mm T/B, Holley Dominator MPFI & DIS, Holley 36-1 crank trigger, MSD 1x cam sync, PA PMGR starter, PA 200A 3G alternator, Optima Red battery, 100HP progressive dry direct-port NOS, R134a A/C, Spal dual 12" fans, Frostbite 3-core aluminum radiator, Pypes dual 2.5" exhaust, off-road X-pipe, shorty headers, Earl's -6AN fuel system plumbing, Walbro 255 LPH in-tank pump & Pro-M -6AN hanger, S&W subframe connectors, BMR upper & lower torque box reinforcements, LenTech Strip Terminator wide-ratio AOD, 3000 RPM C6 converter, B&M Hammer shifter, Stifflers transmission crossmember & driveshaft safety loop, FPP aluminum driveshaft, FPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 M/T Street Comp tires.

  7. #17

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    Hi Danny. Using the 7" stand-alone Digital Dash. The tachometer is eratic even with the conditioner installed on an LS engine with MSD box. Could it be I haven't not shielded wire B5 behind the Digital Dash? Pins 14-18, what are these used for? Should they be earthed for other outputs to work? Cheers, Daniel

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