I read the manual for the Monarch 4.2 and never mentions what air pressure to put in the shock.
I weight 165 pounds, how much air should I put to start with?
I am about 78kg with riding gear and have 190 psi in mine. That gives me 25% sag.
The general rule is to pump it 10 to 15Lbs more than your weight and that is usually where you'll keep it.