Installed the Tach today I used MS21919WDG14 clamps to attach to the steering hoop (I don't like drilling holes in the hoop)
Purchased a F500 Bumper from Wahl Brothers, installed it with AN3-30 bolts and 10/32 Stainless Steel nuts, I used brake line as spacer material
Welded exhaust stinger and mocking up installation. Purchased exhaust kit from Hooper Racing. John Hooper is a nice guy and is more then willing to give help and advise on your F500 build.