I just put an oil pressure gauge on there (used T-Fitting to fit gauge
and oil light switch on engine) and went driving around for a little
while. After driving for about 20 minutes, I noted the following
readings on my oil gauge:

Hot Idle (in drive): 17 Pounds
Hot Idle (in Park): 24 Pounds
2000 RPM: 40 Pounds
3000 RPM: 50 Pounds
4000 RPM: 60 Pounds

My observation is that my oil light (the teapot) seems to kick on when
my gauge gets below 18 Pounds.

Is 17 Pounds of pressure at hot idle ok?

How many pounds pressure is supposed to kick on the teapot light?