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Frank, I've had the same problem. I put a limit switch in play (see pic). It helps to have a long rocker pawl to accommodate a large variation in knob position. Switch is "open" when gas is off. The switch runs a 3v LED with a battery pack thru the window. Helps at night, not so much in daylight. The 3v should not be an ignition source. Gas experts hate electrical switches around gas.
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