Hey spearfish nice diy, i used this to mount the same oil pressure gauge last week. Thought i'd help others with the hardest method to wire. You can connect the red (constant 12v) to the yellow wire (splicing) and the grey to the orange illumination wire (splicing) on the main radio harness. Still route the negative and pink (switched 12v) to the fuse box to prevent feedback. How you like mine mounted? I just moved the starter button.
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