Wiring has been swapped as + and - are marked on the back. Once I figured out that the + goes from the battery and the - goes to the fuse and then to the ignition, it was very easy. This requires 3 mounting screws (not included) and a 2 5/8" hole to countersink it into the dash. It was right on + when I used the little dial to set it to zero -1 Amp In general, it came quickly, works great!
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