Mechanical oil pressure gage help.

Well I just realized when I changed my oil filter the filter was empty, so this leads me to think the relief valve is stuck and needs to be removed and cleaned and from what I have been reading this morning this will make my oil light come on.

http://www.forabodiesonly.com/mopar/showthread.php?t=149910&highlight=slant+oil+pump+install

Thank you slantsixdan