Yellow wire on the wire buss behind the radio. The yellow wire next to the orange wire. The wire to tap into is all the way on the one side of the buss or right next to it.
I just redid my gauges, so I know

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2000 Olds Alero 3400 SFI 14.53 @ 94.93
1985 Olds Delta 88 307 SBO 17.96 @ 76.99
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