Taken from the Pelicanparts web site:
Porsche Boxster 996 Gauge Cluster Upgrade - 986 / 987 (1997-08) - Pelican Parts Technical Article
For the 1997-00 Boxster, you need to find an instrument cluster from a C2, not a C4. This is because the early C4s have a different gas tank and a different fuel sending system that is not compatible with the Boxster. If you install an early C4 cluster into an early Boxster, then your fuel gauge will not operate properly.
As far as correcting the mileage, activating the top light, and possibly a little more you should contact a user here named qmulus.
He might even have a C2 gauge laying around.
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