If you ever wanted to fit a Brantz or Terratrip to your Subaru without having to worry about fitting an extra sensor, then why not make use of the cars existing wiring?
Here's my collection of datasheets for Subaru WRX, Forester and Outback, as well as the all important interface circuit you need to make it all work. (If you try to connect directly without the interface circuit, your speedo will stop working.)

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Here's how to connect your terraphone to your Uniden UHF radio.
I've tested it with a Uniden UH-089, but it should also work with a UH-095 as the microphones are interchangeable.
Let me know if you have any questions or ideas.

click for PDF schematic

Matt