Diesel Bombers - 04.5 5.9 CUMMINS LIGHT BLACK SMOKE AT IDLE

i recently bought this truck it sat for about a year the lady used it on her farm its got about 171,xxx miles on it. b4 i ever started the truck i did a oil changed and replaced all the filters and pulled the common rail off to make sure there wasn't any rust or its in it. everything looked good.:jump: so then i threw my new batteries on it and cranked her up. trucked idled good sounded alright. so i took it for a ride and i noticed it was black smoking alot more than it should for being bone stock. So i figured it might be the old diesel that was in it so i put 10 gallons in it and some POWER SERVICE DIESEL KLEEN + CETANE BOOST as well. from there i went and drove it again truck continued to smoke like b4 but this time when i got to the house the truck was smoking enough at idle that you could see it fairly good. A very knowledgeable friend of mine said it was more than likely a leaking injector. I don't know if the lady i bought it from drove it with it leaking or not so he said to pull the injectors and do a compression test on it to see if she washed out a cylinder.

so i guess where im going with this is if it is the injectors wheres the best place to get the compression test adapter for a 24v. and also what psi should the cylinders be reading. and any other input or help would be great.

thanks