Want to accurately measure fuel and water levels on board your boat? Use a fuel/water dispenser. With a float that indicates the level, you always have insight into your fuel or water supply. Combine with a fuel meter . Please note: when choosing a VDO 0-190 Ohm fuel/water transmitter, it is essential to select a meter clock with the same resistance. Otherwise the gauge may indicate an empty tank even though it is full. This also applies to the USA style with a resistance of 240-33 Ohm.