crxnug

my 1990 has a problem im hoping someone can help, my oil pressure gauge is not working correctly, at times it works, other times it bounces around .most time its maxed out, i bought a new sender and that one does the same , here is what i bought
http://www.ecklerscorvette.com/corve...1990-1996.html

i just noticed another sender just below that one 3 wires, could this be the one and does anyone has a ecklers part number,

any help would be much appreciated