[*67firebird*]

What size gauges (TACH and Speedometer) do i need to do this 5"? or is it a diff type of aftermarket dash?

["QUICK-SILVER"]

I don't know if thats a factory dash. Looks like a custom or modified OE, can't see the seams on either side of the guages where the OE cluster came out.
I've seen several, over the years, with aftermarket guages installed, but that one looks better than most.
I did do a 68 bird that way, not with aftermarket guages. I Used GM parts, factory tach and speedometer out of a vette. Definitely a little fab work involved but when finished gauges looked factory instead of custom. Mounted oil, temp, volts and fuel in the console, modified vette parts from same donor car.

You just need to measure your guages, and see what you can make fit.

I did mine back in the mid 70's, before people got bent out of shape for not leaving it OE.

Let us know how you decide to go with it. I like the look.

[Region Warrior]

Have the same ones in my 68 FB in the stock bezel.
From memory the chrome rings "just" fit inside the stock bezel from the outside "side".
Will measure them next night or two.

[*67firebird*]

thanks for the info, i guess i will have to tear it down and measure the holes.

Region Warrior, that would be greatly appreciated