It is PERFECTLY normal. When the engine is under load, or the oil is cold, it will cause the oil pressure to spike. The oil guage on this truck is an actual pressure guage, not just a fancy idiot light that only warns you once it's too late and all the oil is gone.
So dont worry. You most likely did nothing wrong. Your truck is just reporting its condition. :thumbsup:
yeah what bb said. Mine has done that since day 1. I just give her 10 mins to warm up before giving too much throttle and she is good to go. But yes the gage still jumps up under acceleration even when warm, just not spike.