There's a sharp coiled cablerunning from the light to the wall and a soft place to put things nearby but I never really use it.
那是一卷尖头的缆线，从台灯一直到墙上，那附近有一个柔软的放东西的地方，但说实话我从来就没用过。
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If you don't have such a signal available, you will have to rig a rotary POT variable resistor to the gas linkage ie coupled to something at the gas pedal or throttle cablerunning to the carb or Fl.
This is typically used to detect network failures (cable, switch, router, and so on) where the processes stay running but the communication between them fails.