Ok so I just put in an aftermarket CarQuest Oil sending unit and now my oil pressure is reading the maximum 75 psi ALL THE TIME. Even when Im running at normal temp and the oil is warmed up it still says my press. is at the max. Normally when im in 4th gear and at 2500 rpms the oil press. is about 45ish psi not 75. Anyone know why the sending unit would freak out like this? Is it just a defective unit or is there a certain amount im supposed to tighten the unit? (I tightened it until I couldnt get it any tighter) or somthing like that? Do these things have to be broken in?