This is a common question.
When you remove the old SX-120 you will find it is wired exactly the same as the new one, meaning there will be the same 10' cable with a female BNC on the end. There is an interconnect cable between your knotmeter and speed  sensor [SX-120]. The interconnect cable consist of a 30' run of coax cable with male BNC connectors on each end. One end mates with your knotmeter,  the other end mates with the SX-120. No splicing, adapters or cutting  needed. Just disconnect the old one, connect the new one and you are done.

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