[30 Closed Cab PU]

Somewhere I have seen where a flexible clear tube/hose is added and run up along the side of the radiater. Same principle of a gas float gauge plugged into the bottom of the carb bowl. Sorry, can not remember where it was tapped in - Lower radiater neck, radiator petcock, lower coolant pipe? I believe it was plugged at the top to prevent any coolant loss, and plug removed to read the level.