It is important to note here that the temperature of the cooling water is strikingly different from that of the engine oil - it’s good to know both! Fron the “Tourenfahrer” magazine test results: very good accuracy, worth every penny.
To keep the needle steady the instrument is filled with a glycerine damping fluid, the air bubble is to allow heat expansion. Practical innovation for GS + Dakar: with the integrated dipstick, the oil level can be measured considerably more easily and safely. Simply replaces the original. Complete with seal.