Packard Forum Index » Pre-War (1899-1942)

I have a 1934 1101-718 and would like to know how the switch a 2 way for oil and gas operates

Essentially a single pole double throw switch. The common is connected to the fuel gauge which does dual purpose.

With the switch in the regular position, the fuel tank sender is connected and gauge reads fuel level. Move the switch to the other position, the fuel sender is disconnected and a second sender unit in the crankcase that senses the oil level is connected so the gauge reads oil level.

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The gas/oil gauge switch in my 1934 Eight is different from HH's description. Mine which I'm certain is original to the car is a dead-man or momentary contact type switch. It normally reads from the gas tank sender and to read the oil level from the crankcase sender you press the switch button up against spring pressure and hold it for as long as you want the oil level displayed. Relax your finger pressure and it reverts to reading the fuel level.

There is a SPDT toggle switch under the dash in near proximity, it switches between the instrument lights and the map light.

O_D's switch description of his pushbutton is still a SPDT switch but just in a different format. The spring keeps the switch always in the regular position but still with common connected to the gauge. Always down in the regular position connecting to the fuel sender would be one throw but pushing the button opens that contact and connects common to the other terminal going to the oil sender for the other throw. The PB works the same as a typical microswitch with a common and a normally open and normally closed terminal.

In other words it sounds like it works the same way as the ones RR used for many years (3:23)

youtube.com/watch?t=203&v=cnAUnGjMd5U&feature=youtu.be

thanks

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