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MTX-L Plus Sensor Ground

EFI Wiring Fundamentals

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I have an Innovate MTX-L Plus wideband gauge that i would like to connect to my link g4+, the gauge doesnt have a dedicated sensor ground, only an analogue 0-5v output. What would be the best place to earth the gauge to achieve accurate readings? Engine block?, ECU sensor ground? Other? Thanks in advance.

Engine block is usually the best choice in this scenario.

Sweet, thanks again mate