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Holley EFi 6.86" Pro dash

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Old 05-20-2020, 07:14 PM
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Holley EFi 6.86" Pro dash

Anyone running a Holley digital dash? I did a search, but I only see one post from about 3 years ago and no one replied.

Just wondering the capability of the programming for the I/O's, the manual isn't very detailed on any of the I/O

Last edited by scooter; 05-20-2020 at 08:34 PM.
Old 05-20-2020, 11:38 PM
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Re: Holley EFi 6.86" Pro dash

i am but havent started my car yet. so havent really got to mess with it. the only real input im goin to run is fuel gauge at the moment. if your on facebook look for this group. theyre pretty helpful

Holley Terminator X Owners and Tech


p.s. dont mind the wiring, its all getting re-done once i know everything works.

Old 05-21-2020, 11:04 AM
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Car: 92 Firebird
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Re: Holley EFi 6.86" Pro dash

Thanks for the link to the group. I will poke around there.

Looks like you have the digital dash, not the Pro dash?
Old 05-21-2020, 06:59 PM
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Re: Holley EFi 6.86" Pro dash

yeah im not ballin enough to have the pro. was lucky enough just to get this one.
Old 05-22-2020, 09:27 AM
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Re: Holley EFi 6.86" Pro dash

I ask because there are major differences between the operation between the two. The digital dash doesn't do CAN bus back to the ECM, it's dash only. The 6.8 and the 12.3 both do CAN bus back to the ECM. I am wondering if the pro dash can do automated things with the outputs, like the ECM can. I am trying to see if getting the dash will save me some inputs and outputs on the ECM it's self. I am looking to have it do the reverse lockout on the T56 instead of the HP. I think the GPS from the dash can go back to the HP through the CAN and work the reverse lockout if I can't get the dash to do it automated. That will save me one input maybe
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