Octopus - around my neck on a necklace of surgical tubing.
Pressure Gauge - clipped on to the left side of my bc above the pocket where I can just glance down and read it.
Compass - mounted to a homemade paddle with an extended lubber line, clipped to a ring on the bc’s left shoulder.
Knife - mounted upside down on the right bc strap buckle with stainless steel nuts and bolts. Lays very flat, out of the way, but readily available.
Shears - in a sheath mounted outside the left bc pocket.
SMB/Finger Spool - clipped to the right side of the bc above the pocket.
Backup Light - Inside right bc pocket.