Holley Dominator EFI question

[langleylad]

I'm connecting my Autometer speedo to my ECU via the Holley auxillary harness 558-400 . I'm trying to decide which output to use for the output signal to the speedo . I've looked on the Holley forums , I can't find any answers there or maybe I'm looking in the wrong place . I'm sure it will be either the PWM+ or the PWM- , which one ? . I watched one of Andrew's videos on Youtube , where he connects an electric fan to the Dominator . He chose PWM- , why ? .

[andrewb70]

I'm connecting my Autometer speedo to my ECU via the Holley auxillary harness 558-400 . I'm trying to decide which output to use for the output signal to the speedo . I've looked on the Holley forums , I can't find any answers there or maybe I'm looking in the wrong place . I'm sure it will be either the PWM+ or the PWM- , which one ? . I watched one of Andrew's videos on Youtube , where he connects an electric fan to the Dominator . He chose PWM- , why ? .

I chose PWM- for the fan because the C6 fan controller is looking for that signal.

Does this help:

https://forums.holley.com/showthread.php?8675-Configuring-Speedometer-Output&p=30291#post30291

Andrew

[langleylad]

Thanks Andrew , yes this helps . How do I upload the transmission ICF ? and what does ICF mean ? .

[andrewb70]

Thanks Andrew , yes this helps . How do I upload the transmission ICF ? and what does ICF mean ? .

ICF=individual configuration file. One of the drop down menus at the top will say "add ICF" and in the Holley directory you will find all of them. PM sent...

Andrew

[langleylad]

Got it Andrew , I somehow managed to stumble my way though it . Thanks for the info , I had read it before . It just didn't sink in , I'll just blame my old age (57) .