Had some low oil pressure issues yesterday for the first time ever. Could barely get 10 PSI on the highway at probably 2,500 RPMs. At idle dropped to almost zero. Of course I did some internet research and from what I've read I should first verify the oil pressure with a mechanical guage and use that info to determine whether my sending unit is bad. If it checks out them maybe a replacement oil pump. Read a little about using a high volume, or perhaps high pressure, oil pump. Also read some stuff that said if the pump is too high volume, then the suction from the oil pan will outrun the oil that can drain back into the pan and will pump the pan dry. Question...is it very hard to change out an oil pump on this motor? Comments on whether I should just get a stock replacement oil pump? Or upgrade and if so...to what?