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Thread: Digital Dash Fuel Level Gauge

  1. #1

    Question Digital Dash Fuel Level Gauge

    How can I hook up a fuel level input to a Dominator ECU to use with the 7" Digital Dash? I have a '64 Dodge with this system installed, the fuel tank level output is a single wire.

  2. #2
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    Yes. Wire it into the Digital Dash because it has the Custom Ohms for the fuel sending unit input. It's the new Customize Gauge parameter - "Averaging" (under Updates Per Second).
    The fuel level sending unit wire will go to the I/O Adapter/Vehicle Harness. It's Pin 13 (IO10) of the Digital Dash I/O Adapter Harness (built-in Ohms signal stabilization).
    The Holley ECUs don't have the signal conditioning for a stable fuel level gauge display. The Digital Dash does. That's the purpose of the Digital Dash (instrumentation).
    http://documents.holley.com/199r10954rev2.pdf (Digital Dash I/O Adapter Instructions, Pages 2-4)
    https://www.holley.com/products/acce..._touchscreens/ (Digital Dash, I/O Adapter & Vehicle Harness Kits)
    http://forums.holley.com/showthread....0542#post80542 (Digital Dash Fuel Level Gauge)
    http://forums.holley.com/showthread....8263#post78263 (Digital Dash Fuel Level Input)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 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 tires.

  3. #3

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    I was not going to use the I/O Adapter, just try and use an input to the Dominator ECU. I believe the link above is for the I/O Adapter. Any thoughts?

  4. #4
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    The Holley ECUs don't have the signal conditioning for a stable fuel level gauge display. The Digital Dash does. That's the purpose of the Digital Dash (instrumentation).
    http://forums.holley.com/showthread....Dash-Connector (Using the Digital Dash without the I/O Adapter.)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 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 tires.

  5. #5

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    This Gauge Averaging (this feature helps smooth fluctuating sensors, including fuel level senders providing you with accurate readings at a glance), is from the front page with the update I just did for the 7" Digital Dash. So I guess this is only with the I/O Adapter? I kind of interpreted it that with the new update, the Digital Dash would do this stand-alone (using the Inputs in the Dominator ECU without the I/O Adapter).

  6. #6
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    Quote Originally Posted by fuseable View Post
    This Gauge Averaging (this feature helps smooth fluctuating sensors, including fuel level senders providing you with accurate readings at a glance), is from the front page with the update I just did for the 7" Digital Dash.
    This is what I was referring to in post #4.

    So I guess this is only with the I/O Adapter?
    Yes. You can try it from an ECU Input, but it most likely won't stabilize the fuel level reading, because the source (ECU Input) will be wildly fluctuating.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 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 tires.

  7. #7

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    Hi Folks. I have connected the fuel level gauge display on my vehicle via the IO harness and Digital Dash. It seems to fluctuate at times, i.e. when the fans kick in, the level jumps higher, etc. My thoughts always go to bad grounds, or a faulty sender (it's a one wire GM style 0-90). However, I find it odd that the level fluctuates when the fans kick in. I was just rereading the installation instructions for the harness, and it mentioned that "pin 19 must be connected to a battery or chassis ground..." under the RPM section. Is this a general statement or specific only to the RPM functionality, as I have connected none of the ground pins and I'm thinking if this could potentially be one issue? Thanks for any help in advance!

  8. #8
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    Question, for adding the fuel level gauge on the Digital Dash, what Value To Monitor do you use? Thanks, Ruben.

  9. #9
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    Follow the Digital Dash instruction manual on page 3: http://documents.holley.com/199r11021.pdf, then see post #2 above.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 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 tires.

  10. #10
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    Sep 2015
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    Thanks Danny. For some reason fuel level was not a option, so I went back and re-downloaded V3, then V4, and the name came up in the dialog box as a option. Thanks.

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