For those interested in having the dimming feature on an AEM or Defi Racer oil pressure gauge work, read on. Each of these gauges has a wire as part of the power harness that's supplied with the gauge that when connected results in the gauge dimming when the headlights are turned on. It's the grey wire in the AEM harness and the white wire in the Defi harness. In order to get this feature to work on my 2013 Z, I tapped into the red wire running from Terminal #9 of the M81 connector that connects into the audio unit. The wire is labelled "ILL(+)" in the FSM. You can find the details on p. PG-91 of the FSM for the 2013 model year. (Presumably, the FSMs for other model years will show the same type of connector and terminal, but they may be numbered differently (IDK) … anyway, look for the ILL(+) terminal on the audio connector). I ended up cutting the red wire, carefully trimming back the insulation on both ends, and then splicing in the wire from the gauge using a 22-18 AWG solder splice. Be advised that it's a bit of a labor-of-love since you have to remove a number of trim pieces in order to access the connector at the back of the audio unit … as well as run the gauge wire from the fuse box located in the driver foot well up and around the pedals and feed it to the back of the audio unit. Anyway for those interested, it works.
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