65 Formula S tach mounting ?

What I found were actually Phillips screws into those funky looking "nuts" It was very helpful removing the dash cluster and I used a mirror to see what I needed for tools. Thanks Guys
I used threaded studs screwed into the 4 tach mounting and attached with nut and a spacer for each. Screwing nuts on the a stud during re-installation is much easier than hoping to find where the threads are on the tach mount. Also, a nut can be held in a socket which helps when fingers and hands are large like mine.