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I love my 188c. i often think about getting bigger/badder/newer, but if it ain't broke, don't fix.
i bought a new wiring harness 2 years ago, and it seemed like it was universal. The antenna I am almost certain it is universal (to garmin of course). but like numbskull said, call garmin, i'm sure they will have the answer even though the 188c is no longer supported.
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