Can I fit a sight gauge to a Heating Oil Tank?

A sight gauge is a small tube typically connected to the bottom of an oil tank line using a feed pipe and attached to the side of the tank (though there are different varieties available). Sight gauges use gravity to provide a visual guide as to the amount of fuel left in a tank.

A sight gauge may be fitted to an oil tank so long as its fitting does not involve the creation of a new valve below the level of maximum capacity.  UK regulation rules out this option for a multitude of reasons. The primary reason for this ruling is the added risk of spillage caused by the addition of any openings below the maximum level of oil and fuel tanks. Spillages and leaks can be highly detrimental to the environment surrounding a compromised tank, and very costly, so all necessary steps should be taken to avoid them.