Parking brake light illuminates when shifting

[3kakr4]

I have a 2WD 1991 Ranger with the 4.0 and Mazda M5OD-R. I did a bit of searching, but wasn't able to really find anything pertinent, so here goes.. The issue I'm having is that whenever I depress the clutch to shift, the parking brake light illuminates. After I change gears, and let the clutch out, the light goes off. The only other clue I have is that the "Antilock Brake" light is on and stays on. I've only had the truck a couple of weeks, and am just now getting time to perform the exorcism on a new-to-me truck. Thanks in advance for any help.