Check your owners manual to see if there is a Maximum Pressure stated. IMOP, you would be better to rig a pressure gauge to connect to the CG'S connection before you install your hose. If the pressure is 50-55 Psi or less, no regulator is needed. Only use a reg if the pressure is higher than stated in your manual or over 60 psi as a round number.
If you install a reg with 50-55 Psi, you will certainly see lack of pressure inside.
Dennis & Carol
2003, 4006, 41' DutchStar,
Spartan, ISC 8.3L W/BanksPower - 2013 Honda CRV, BlueOx Baseplate, Aventa Bar & Patriot Brake. And the 04 Bird, Sunshine Car.