This is what I have on my Pontiac 400. It's a knock sensor you can get on eBay and it's just the gauge that converts digital Signal into readable information. All you have to do is buy a knock sensor from any vehicle Chevrolet Volvo VW and hook it up into this device. It works well I asked my wife to look at the sensor while I took a ball-peen hammer and lightly tap on the engine block and sure enough and went into the red. I've been driving now for a year or so and it definitely works. I change spark plugs too cold ones and knock went lower then I switch to a different type of gas with no e 85 and knock was even lower
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