Oil pressure sending unit does not tell you the oil level, but the oil pressure in the engine. A 93 LX oil pressure gauge is probably just telling you that it has oil pressure, not the actual pressure.
Ok well i might not be calling it by the right name then but the thing i have looks like a sensor that is right below the Alt. what the hell is this sensor before i try to get it off its in a tight ass place too
As you are looking at the engine from the front, is it on the left side of the front timing cover? If so it is the oil pressure sending unit. The oil level sender would be in the oil pan, if you have one.