THUD ! Tool will only support OBD2 cars from 1996 on up, however if the 95 K1500 has a 16pin connector under the dash and if the abs system can be accessed through it , you could try and ID truck as a 96, like I did with my 95 Explorer

 Even though OBD2 required the typical 16 pin connector and some manufacturers actually had OBD 2 style16pin connectors on  some models a few years ahead of being mandatory they still had OBD1 engine control system.After 96 other makes still had their old style OBD1 style connectors until they realized it's cheaper to put everything off the single  16pin connector, LOL