Stereo System to Replace stock system on 1988 GT (Page 3/3) Raydar AUG 19, 10:07 AM Check out the tuner in your DEH-P77DH carefully. Mine always sounded like it was "off frequency" just a bit. Never got it sorted. I even had the service manuals for it. Couldn't find any way to adjust it. (I worked on commercial 2-way FM radio for a living. I know how to align receivers. Should have been about 1/4 turn on a coil core. But not this one.) OTOH, I don't know of anyone else who ever had a problem with a Pioneer tuner. I probably just got a "lemon". Sorry... don't mean to "whiz all over" peoples' comments. Just my own experiences. Vintage-Nut AUG 19, 11:11 AM This link from Michigan Fiero Club is a tip for the GM auto reverse AM/FM tape player.... https://www.michiganfierocl...965d57bc7ae3c7b5.pdf richard in nc AUG 19, 06:07 PM quote Originally posted by Raydar: Check out the tuner in your DEH-P77DH carefully. Mine always sounded like it was "off frequency" just a bit. Never got it sorted. I even had the service manuals for it. Couldn't find any way to adjust it. (I worked on commercial 2-way FM radio for a living. I know how to align receivers. Should have been about 1/4 turn on a coil core. But not this one.) OTOH, I don't know of anyone else who ever had a problem with a Pioneer tuner. I probably just got a "lemon". Sorry... don't mean to "whiz all over" peoples' comments. Just my own experiences. i only listen to am or fm when i have to so i haven't noticed.