I used this sensor to measure compression on a Mazda rotary engine. Used USB cable for +5V source (connected to USB charger). The colors of the wires are indicated in the description of this product. Worked very well when connected to an oscilloscope to measure the compression of each rotor. I used spark plug adapters from another compression tester I have. Also needed a threaded adapter socket I bought from Home Depot to match the threads.
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