catalina27-talk: wmar vhf 500 hookup

[uprr]

i need help
i have bought a wst mar vhf 500 radio
in of radio has 3 pigtails, 1 +/- to power the unit, #2 for wham mic, and
finally acc has 7 wires.
2---pa    2---ex speaker 1---nmea data in   1---nc   1---12v
the wire with 12v as stated in manual----12v and gnd are gps ant
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uniden radio,with wst mar cover and sea ranger  vhf 50, are the same
radios with same manual
please help

del kleitz 3561 std a4 '78 bensenville,il