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Update
My handheld oscilloscope has a built in adjustable square wave freq and duty oscillator, I mimicked settings I see on this sight and dialed it in for my first test bench mpg readings! I'm not yet clear on how to see distance travelled, or mph, but I will keep striving!
I can see how the duty cycle or pulse duration affects fuel usage!
Now I need to find vss on my speedo, and see what pulses are available. I was hoping someone has done a 1994 gmc Sierra truck and had pointers.
I'll keep updating! Thanks!
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