Tach on a 6.2 Diesel??

[67_C-30]

Thanks for help once again guys. I am installing the 6.2 in my '67 C-30 as I said before, and I have gauge cluster out of a big 2 tin truck. This cluster has the factory tach and air pressure gauge for the air brakes. I might to have to use aftermarket5 unit, but use a custom face that wiull look factory in my dash. I want to add a turbo to my 6.2 like Arveetek and Grape, so I also want to modify the air pressure gauge to read boost. I think this will be a super trick looking mod on an old truck. Check out pic below. I think it would look pretty good.