Odd question
 

I searched around but couldn't really find much specifically. I pulled my engine harness out and converted it to a single, removed emissions, solenoids etc. Today I put the harness back into the car, I DID NOT HOOK UP ANY CLIPS. All I did was run it through the firewall and hook it up to the PFC>... Now, I put the key in the ignition and turned it over just for power and I looked at my screen and there was nothing. The screen was just blank. I did ground the PFC, but shouldn't at least the screen come up? Or do I need to hook everything up? I know there are grounds in the harness, would that cause it to not show up? More curious then anything... thanks.

Engine harness needs to be grounded for the PFC to turn on.

Thanks I had a feeling, just a test and see kind of thing I was doing.
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