Mico lever lock supplemental parking brake

I worked for a towing company that had them on all the stick shift trucks. They worked awesome. The oem e-brake was never enough to hold the tow truck in place while winching. Most of the older trucks had one line that went to the rear brakes and the mico was installed on the floor in front of the drivers seat or between the seat and the door. All that was required was to tie into the rear line. There was a special adapter kit installed if there were two hydraulic lines going to the rear. It even has a pre-wired circuit to wire to a buzzer or light to indicate low pressure. It was very simple to set oem brake, flip the lever and pump the pedal once and hop out.