Abstract: An apparatus for selectively establishing the depth at which a hand-held wiring gun will wrap stripped electrical wire about electrical-connector Wire-Wrap pins, which pins are mounted upon an electrical interconnecting back panel, is disclosed. The apparatus includes a collet that is affixed to the gun's fixed sleeve, through which sleeve the rotatable wrapping bit extends axially. A level gauge is axially, helically, rotatably affixed upon the collet by a leaf-spring compressed ball bearing that rides in and along a helical groove in the external cylindrical surface of the collet. The helical groove has three detents spaced therealong into which the ball bearing is compressively secured by the spring. The axial dimensions of the three detents from the front face of the level gauge, which front face is of sufficient frontal dimensions to rest upon the tops of adjacent pins, establishes the three selectable depths at which the wire may be wrapped about the pin.