Yes that is very low. Try a different gauge, Has the moror been sitting for a while. Is the starter cranking fast enough? A good one would be over 100 and better would be about 120 and great would be above 130
They will sound " great " on muffs running on 2 of 3 cylinders.-------Does the pee hose come of the side of the block or from the top ??----If it does not perform on the lake it needs some trouble shooting done.