Vintage amperage gauge made by the Nagel electrical company Toledo/USA. As used in 1920s American cars. Diameter of the barrel is 50mm. Comes with its clamp. Location: OS Amp Box 2
Photo with the pump , and one photo of a similar type taken in the twenties / Thirties . Mine is unscreved into 2 pieces and can be transported in a van. But quite heavy.More photos of request.