1980 kz750 oil pressure light coming on when hot

Has anyone had any issues with the oil warning light coming on when their bike is hot? Running around home here it doesn't come on but the other day I ran it about 25 miles and got stuck in traffic and it would come on at idle (about 1400 rpm) it would usually go off at about 1800-2000 rpm. Stopped for about 1/2 hour started it up and it was good again until I was again in slow traffic. Once I got out of town and got some speed(cooling) it would "flicker" at idle. Running Rotella 15w40 oil, fresh change with a new oil filter and I didn't notice anything in the oil at the last oil change (Monday evening, 150ish miles ago). I did think the bike ran hot but can't see how to improve the cooling any other than by adding a oil cooler. Could be running a little lean causing some additional heat but with fresh carbs and everything at stock settings I don't think that is the issue. Unfortunately I have no history on the bike so I don't know if this was an issue before. Thanks.

You should get a gauge and check the pressure.
Steve

UnfortunatelyI don't have the fitting to attach my gauge to the test port. Is there another place I can tap into the oil pressure system?

You will need a fitting no matter where you test it.
Steve