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Old 11-25-2021, 09:19 AM   #2
Mulder
Trust no one
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Member#: 11170
Join Date: Oct 2001
Chapter/Region: Tri-State
Location: NYC
Vehicle:
02 RAV4 MT
15 WRX/11 CRZ

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Subaru uses a variable-negative circuit for dimming which is not compatible with many gauges that use a fixed ground/variable positive setup. If you have a gauge where the signal and lighting inputs share a common ground, you can't connect the lighting wire to the car dimming circuit or you may get unwanted results. The best situation here is to have lighting connections that are completely isolated so you can connect them any way you want.
Also if your gauge uses LEDs instead of bulbs, even with the correct wiring they will not dim as you expect. LED's don't dim in a linear manner like bulbs do, which is why LED dimmers use PWM rather than variable voltage.
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