Mr. Doyle! How are you? Still owe you some pictures of the MSD installation, I know.
On my 8, I have a three gauge (2 1/2 inch Stewart Warners) for oil temp, water temp and oil pressure in an fabricated alum panel that fits into the space where the vents used to be in the middle of the dash.
Seems to work really good. Aluminum wasn't that hard to bend on a good solid work table.
Hope you are well.
Jeff