Gear Vendors in but big engine problems

Got the gear vendors in and seemed to be working well. All of the sudden no oil pressure and I was running it hard. Heavy knocking started by the time I caught the oil gauge at 0. Had it towed to my house and now I need to diagnose. WTF It has less than 2500 miles on the engine. Please tell me it something simple. I hope I didnt trash my new engine.