Possible Oil Pressure Problem

Hello all and thank you in advance for any help.

I have a 88 mighty max 2.0 that develops a oil leak at the oil pressure sender. I have replaced 3 senders in the last 4 months. I have the dummy light and not the PSI gauge. I did install a balance shaft replacement kit during the rebuild.

Can someone tell me what my oil PSI should me for this engine. If I have to much oil pressure is there a way to adjust the pressure relief plunger and spring?

any and all help will be great
Thank you
Nick