So i purchased a prebuilt version recently tested it with the rpm simulator and all works. Tapped in the coil #1 on my car (2016 Mustang GT) and it reads weird. set it too 4ppr and at idle 650ish rpm it reads 8700 on the screen. But when i rev it to approx 1900-2000 rpm and hold it read in the high 200. Not sure if the signal is just a bad location. Doing all this under the hood testing pin locations. I have this connected directly to battery power and ground, i've tried different grounds with no big change. Does this need to be behind 12v switched power and is the a way to read the output from my car without an oscilloscope. I'm just a small tinker and don't have much in regards to tools like that.
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