My 2006 ram 2500 big horn edition 4x4 would have the oil pressure gage drop when the check gages light came on and bell (ding ding) would sound, only when I jumped on the pedal to pass on the freeway ( like from 60mph to 70mph. I would have to pull over stop and shut off the truck to get the gage light to go off. I always would check the oil to make sure, and it was ok. Then one day the check gages came on and then the oil pressure showed 0 and the engine made a funny noise other than the ticking sound. I towed the truck back to my place and checked the oil and it was fine. I pulled the plug on the pan and nothing came out. I stuck a screw driver into the hole and out came the oil. When I dropped the oil pan, I found lots of little and big pieces of metal. Threw a rod. Pieces of rod pistons and ??. Get the check gages checked out Asap. A friend of mine sells Snap on Diagnois computer code analyzer and it said I had mechanical engine failure.