Thanks kk68. Those pics are helpful. I'm using the template provided with the tach and it puts the center of the hole 13" from the back edge of the hood. 3/8" closer than yours and I guess that's close enough but it looks to me that you barely had to touch that hood bracing when you cut your hole. Mine appears to be taking quite a lot more from just eyeballing it. That's a concern because I don't want to have to cut through any more of that bracing than I have to.
In fact, as close as I can tell, the front edge of that bracing is going to wind up almost at the center line of my 3.75" hole! Right about where the threaded studs are. I think I need to move it up 3/8 to 1/2" to be closer to where you are.
Also, that 2* offset isn't mentioned. If anything, looking at my pattern it seems to be offset about the same amount but in the opposite direction.
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