Im working on putting the dash back together, one of many projects going on with this 68 300 project! Got all the parts together and ready to reinstall, but this part im not sure what it is or for, speedo was all that was in place, but was removed at one time. Ive got all wiring harnesses and plugs ready, but this was not hooked up and i dont see any wires that go to it. I looked at parts manual that Big John showed me, best i could tell it calls it a limiter? Can y'all help me with this so I can get this dash back together?!?! Correctly!