tach,temp gauge need hose size

[outlawauto38]

i want to install a koso tach/temp. gauge in a 04 venture. i need to know the id in mm of the radiator hose can anybody help? my bike is in deep storage up here in mn.

[KiteSquid]

I cant measures mine now, but do you have a URL to the guage set you bought?

[outlawauto38]

kosonorthamerica.co