Just ground it. That's all the parking brake does is ground it out so if that wire is grounded the DVD will work all the time.
'95 Ranger 5.0 GT40X Tri-y GT40 Intake S-Trim Snow Stage 2 Lowered Baer Racing Brakes Viper Spec Tremec w/Hurst shifter Custom Interior Dakota Digital Dash Corbeau Toplines OZ Racing AM/FM/Mp3/CD/DVD/TV.
2014 GTIG 5.0 Vert Base. Sil Carb Fiber dash. Bama Race Tune. Gibson axle backs. STEEDA Springs KONI STR.T Adj. Panhard. Dynamatted. Audiocontrol LC8i Amps and Sub! Leather OEM seats. Custom Badging.