Sorry to disappoint you, but a KLN94 doesn't meet the required standard for ADSB. You need to have An FDE enabled device, read TSO145 or better. The KLN94 is only TSO129.
I've been going through this process working out the costs of upgrading my machine, and the with the cost of upgrading the 430 to the W model (TSO145a), the cost of replacing the transponder and the paper work etc, it will be around $15k depending on the exchange rate.
For those that don't have an upgradable GPS, around $20K sounds about right.
I'll also add ADSB in to OzRunways to get some use out of ADSB, can't really see how it will help me otherwise....