Digital Dash Fuel Level Gauge

[fuseable]

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.

[Danny Cabral]

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)

[fuseable]

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?

[Danny Cabral]

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.)

[fuseable]

The 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).

[Danny Cabral]

The 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.

[tangel]

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!

[Badchev]

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

[Danny Cabral]

Follow the Digital Dash instruction manual on pages 3 & 4: http://documents.holley.com/199r11021.pdf, then see post #2 above.

[Badchev]

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.

[Danny Cabral]

You're welcome. Glad you found it.

[tangel]

Do any of the "ground" pins on the I/O Harness need to be connected for the fuel gauge to work properly? I have followed all instructions to the best of my knowledge, however, I still get some fluctuation when the fans kick in. Wondering if I missed a step, or misread the instructions for the I/O Harness. Thanks, Tom

[Danny Cabral]

Do any of the "ground" pins on the I/O Harness need to be connected for the fuel gauge to work properly?

The ground needs to be a good ground. Actually, everything needs to be well grounded (it's a common problem). Here's just one example: LINK.
https://forums.holley.com/showthread...034#post234034 (Digital Dash Fuel Level I/O Ground)

[tangel]

Awesome, thanks for pointing me in the right direction, much appreciated! Tom

[Injection Connection]

Awesome, thanks for pointing me in the right direction, much appreciated! Tom

I realize this thread is a couple months old, but did you solve the problem? We're experiencing the same thing on a '93 Mustang & I've checked every ground I found & even added extra ones & the problem still exists.