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The oil pressure switch is really needed in this circuit!
If you don't have it.......the choke heater will run all the time.
The switch is only $6 at the Chevy place and screws into either the side of the block above the oil filter or on the little tee beside your distribitor.
I have a new one I have to install as soon as the sun comes up..........mine quit after 20 years and now my choke will not go off.
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