I have owned my 1985 short box 4x4 for about 10 years now. Decided it was time to freshen it up a little and add fix some issues. One issue is I have never started this pickup with a key. Mounted to the lower dash is a black plastic case that contains a switch with a twist knob. The knob has all the functions a key style ignition has and plugs into the factory harness. On the case there is a number and a pentastar logo. Is this thing factory? Aftermarket add on? Don't know how to post pics and forgot to get the number off of the piece.