Well, not being one to give up so easily, and primarily because I like the look of the stock overlay, I went to work. I installed the gauges temporarily and got to measuring.
Turns out the holes were off almost .050. So I got out my Xacto knife set and trimmed about .035 off the top of the dash indicator holes. They were the main hold-up. Everything else could be adjusted. I reinstalled the gauges and indicators, and was pleased with the outcome. I also removed some of the excess molding flash from the drivers side of the overlay. Then for the install. I removed the backing paper from the left side, folding it over mid-point of the Speedo. Using a small spacer, I pushed the indicator lamps through to use as an alignment tool. Then I reinstalled the oil and volt gauge to lock in the position. Removed the spacer and slowly lowered the drivers side into position. Pressed it down firmly. Then I removed the oil and volt gauges, and carefully reached under the unstuck part of the overlay to grab the backing paper that I had folded under. I carefully pulled and removed the rest of the backing. Putting the spacer under the right side, I set the oil and volt gauges in position. Happy with the placement, I removed the spacer and stuck it down. Perfect!
Whew!
But... I had forgotten to cut for the A/C vent. I really wanted to do that away from the dash, but now that’s not possible. Measures about 10 times. Then masked off for surgery.
Using the Dremel with a thin cutting wheel, I cut the opening. Once done I removed the tape and dressed the edges with a file.
I reinstalled the gauges hopefully for the last time. I love how it looks with the in- dash vents! I just have to paint the bezels on the indicators aluminum silver and I should be ready to call this step done!