Tim - The Northwest 1969 Camaro
Great to hear that worked!
Based on reply on Holley page it appears that although I had the red/white wire connected to a +12v it was not the correct +12v.
I now see on page 16 that it says "Brake Switch Wire – This MUST be connected to a +12v input from the brake pedal switch" (not sure how this +12 would be different than the one I picked but the system must be smart enough to know the difference?)
I will give this a try when I get home tonight.
The only thing I can think of is the brake switch is un-switched power i.e. full time +Bat. When I was putting my car together I noticed many suppliers make a point of separating +ign from +bat particularly with some of the LS components as well as my gauges and VA wiring. Might be your issue.