Water pump hoses

[YYC R3 rider]

Hello everyone I have recently purchased a 2009 R3 Touring. I’m going to put a tachometer on it and the tachometer also monitors coolant temperature. In order to do so I am going to install a sensor in one of the water pump hoses. Does anyone know the inside diameter of those hoses in millimetres so I can order the correct adapter?
Thank you in advance for any assistance