tapping it should be easy as Pie..,the innards are like the 106-97,,psr500..300
its marked TP4,
look here at my radio,,
Pro-106 Discriminator Tap - The RadioReference Wiki
ive got the specs for the 97,it should be very similar,as long as your soldering to TP4 your good to go,
make sure to NOT to connect your ground to the antenna ground point..
PM me for more details..or if you want teh 97 seervice man,for a reference point..
Just open your radio,and look for it,if you see it,,BooohYaahhhh!