Thanks SVOboy, I need the information specific to the spiffie kit though. They use a telephone jack soldered to the pcb, into which goes a phone line. The phone line then plugs into an ordinary telephone wall jack box hidden under-dash, whose inner connectors each have one of the two signals, or pwr/gnd. I don't know which signal the four inner connectors want and I'm scared I'll explode something if I do the old trial and error
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