line lock

The 67 454 that i just got has a switch an a red light under the dash. I didn,t notice this at the time i bought it, but maybe it,s a bonus. Anyway a friend said that it could be a line lock setup, although we don,t see it on the master, could it be a trans lock between 1,st and 2nd. It has a 3200 stall kit, BM Star Shifter,headers,MSD ign , 67 ss. Thanks