Before drilling holes in the new dash, need to confirm locations of lamps and speedometer placement. Would love to evaluate 1911 and 1912 data.
One or two piece dash?
Here's an earlier post with lots of info and links about the '12 dash: http://www.mtfca.com/discus/messages/179374/216356.html
Here's the speedo placement on the one piece dash: http://www.mtfca.com/discus/messages/257047/308677.html?1346519948
And here are the side lamp hole positions for the one piece dash: http://www.mtfca.com/discus/messages/80257/82960.html?1235585602
Late 1912 Beaudette and Fisher Touring Fore doors completely conceal the (2) side lamp bracket hardware from the inside of the dash. I have also seen credible 12 examples where these fasteners are exposed. I'm not the expert, but I don't believe there is one correct set of these hole locations that apply to all 1912 single piece dashes.
The dash to body bracket holes are NOT shown on the early (through at least 1914) dash drawings since those "butterfly bracket" holes were drilled in place to fit the body that was bolted to the dash. While the basic dash drawing was the same for various body styles, those bracket holes can be found high, low, wide, and narrow depending on the unique body style and body maker. If you have an early body you should NOT remove the old dash and leave it off with nothing holding the front body ends from spreading and/or twisting. If nothing else, take a scrap sheet of plywood and make a "keeper" dash to hold the body at its usual width and without twist or you will have a nightmare in a year or so when trying to fit a dash to that body.
I have an original dash from a 1912, that had front doors. The dash is rough but its yours if you want it. It's excellent for a pattern.