Oil Pressure Gauge?

[ExTREME]

So after I successfully installed my first tranny I was going through the reinstallation and hookup process. Well I started my car, the gauge on the cluster shows no Oil Pressure/Level? I checked and I have plenty of oil, I changed my oil, fixed my radiator hose leak blah blah blah. I hooked up my DSMlogger and it shows I have pressure. Shows in the "atm" unit. I'm not sure on the correct level but why is my oil gauge not working!? Anyone know what the DSMlogger should be reading for OILP - ?

Thanks!
-SA