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Help with narrow band air fuel ration gauge install

Old 09-29-2018, 02:59 PM
ThreeJAYSDaddy is offline
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Help with narrow band air fuel ration gauge install

Hello everyone. I already know...the gauge it. This is actually a learning lesson for my son on basic wiring as he is in the STEMM program at his high school. So I figured I but this gauge and teach him the basic of chemical air mixes and the differences between the measurements from the welded bung reading and the electrical reading. Problem is, I am having the hardest time finding which wire in the PCM atl tap the purple wire into.

2003 HD F150
autotmeter phantom narrow band air fuel ratio gauge
12 v and Gnd are easy...looking where the purple wire goes...any help would be greatly appreciated.


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