Pressure Gauge for Radiator
I have a pump used to test coolant systems and pressure-caps for leaks. I bought it so long ago I do not remember where. In one method, the radiator cap is attached to the pump and the gauge shows the pressure it will hold. Older caps held about 15psi. If the cap did not hold the pressure marked on the cap, it was replaced. This pump has a second test method - to pressurize the cooling system to check for leaks. Simply pump it up to the cap release value and watch for leaks. If there are no leaks, the guage stays constant. Of course, this gauge only reads pressure when the pump is installed on the cooling system. I find that is enough for me. You may be racing the car and want to see pressure loss immediately while driving. Good luck. For those who said the pressure can vary all over the place, isn't there are pressure release cap that feeds to overflow tank? It think the cooling system pressure works like my wife's pressure cooker - it holds pressure to reduce evaporation at high temperatures and to increase the coolant boiling point. The car cooling system, once warmed up and pressurized, should maintain a constant pressure until the engine is shut down and the system begins to cool.
05 M6, peddarized, GMM Ripshift Street, Magnaflows, H-pipe, JBS shorties, Swede OTRCAI, one piece driveshaft, dash gauges, skip shift delete