Customer is asking me to install a pressure gauge on the discharge of his oil burner pump. I have recently been licensed to do boiler tune-ups, but I have not done this as a permanent installation. Has anyone done this or have any advice on method of connection or placement of the gauge? It is a Viessman boiler(forced HW) with a Beckett NX burner. Sorry if this is a rather novice inquiry, but I just want to make sure I do it correctly.Thanks.