Partial Cluster Power - probs not an IVR issue

Could use some help. I changed to the RT Engineering IVR last week and am having problems now that I didn't before - namely, parts of my cluster are not live.

'68 Barracuda

I'll start by saying, the IVR red lamp is blinking, and there is 12V at the appropriate post on the circuit board. All the lights work on the cluster. I added a positive ground from a grounding screw on the circuit board to the chassis. Things seem OK so far. The car runs - had it out today.

But...

1. Fuel and Temp gauge still not operating (Fuel used to work - somewhat)
2. Brake and High Beam indicators not working (new problem)
3. No power to the INST fuse at the box in Acc or Run positions (new problem)

I've been under the dash more time today than I slept last night. I'm scratching my head on this one, hoping someone here is smarter than I am (not difficult) and has an answer or at least some tips.

Thanks all,
Chris