Well... Something has gone wrong, but I can't determine what. Battery was dead this morning. I think I am going to start a new thread on that problem, as I could really use some suggestions.
Meanwhile, here's some pics of the V-n-T array.
The misalignment is all due to the velcro. I could rotate the tach in the mount, and/or do the same with the vac guage, or rotate the whole vac guage psuedopod, but I think I'll just leave it alone until I devise a better mounting method overall.