jrios

I am having issues with low oil pressure after the car warms up. I would like to verify this because I have had it drop in the red and there is no extra noises coming from the motor. Is there an easy way to hook up a mechanical oil pressure guage or do I have to T off of the stock sending unit. Also, I did replace the sending unit, changed oil pumps and moved my oil weight to a 40 weight oil and none of this made a difference.