You need something like the FS Panel Studio so you can create the windows and add the guages for the GPS, radio stack, and autopilot -- they don't exist in cfs2 default planes.  Here is part of the pnl.cfg of what I did to the P38:

[Window Titles]
Window00=%window_title_00%
Window01=%window_title_01%
Window02=GPS

//--------------------------------------------------------
[Window00]
file=Panel_Background_640.BMP
file_1024=Panel_Background_1024.BMP
size_mm=640,480
position=4
visible=1
ident=MAIN_PANEL
sizeable=1
render_3d_window=1
window_size= 1.000, 1.000
window_pos= 0.000, 0.000

gauge00=P38F_Lightning!Hydraulic-Warning-Light,  96,294,12,12
gauge01=P38F_Lightning!Fuel-Tank-Content,  35,342,60,60
gauge02=P38F_Lightning!Ignition-Switch,  6,413,64,63
gauge03=P38F_Lightning!Magnetic-Compass,  140,259,66,66
gauge04=P38F_Lightning!Altimeter,  101,326,83,82
gauge05=P38F_Lightning!Fuel-Selector,  75,412,65,65
gauge06=P38F_Lightning!Directional-Gyro,  217,263,62,62
gauge07=P38F_Lightning!Airspeed-Indicator,  192,326,83,82
gauge08=P38F_Lightning!Left-Engine-Gauge,  144,409,70,70
gauge09=P38F_Lightning!Right-Engine-Gauge,  218,409,70,70
gauge10=P38F_Lightning!Turn-Coordinator,  282,326,81,81
gauge11=P38F_Lightning!Landing-Gear-Flaps-Indicator,  293,409,70,70
gauge12=P38F_Lightning!Attitude-Indicator,  370,259,77,77
gauge13=P38F_Lightning!Climb-Indicator,  370,339,83,81
gauge14=P38F_Lightning!Clock,  385,  423 ,56,56
gauge15=P38F_Lightning!Coolant-Temperature,  455,270,61,61
gauge16=P38F_Lightning!Left-Tachometer,  463,410,68,68
gauge17=P38F_Lightning!Right-Tachometer,  534,410,68,68
gauge18=P38F_Lightning!Left-Manifold-Pressure,  458,332,73,73
gauge19=P38F_Lightning!Right-Manifold-Pressure,  534,332,73,73
gauge20=P38F_Lightning!Master_Switch,  608,435,25,35
gauge21=P38F_Lightning!Icon-Engine-Controls,  51,323,12,12
gauge22=P38F_Lightning!Icon-Map,  69,323,12,12
gauge23=simicons!Collective Icon,  296,312,12,12
//--------------------------------------------------------
[Window01]
Background_color=0,0,0
size_mm=175,188
position=6
visible=0
ident=THROTTLE_PANEL
sizeable=1

gauge00=P38F_Lightning!Engine-Control-Unit,  0,0


//--------------------------------------------------------
[Window02]
Background_color=16,16,16
size_mm=150,250
window_size_ratio=1.00   
position=8
visible=0
ident=GPS_PANEL

gauge00=gps!gps,  0,0,150,250
------------------------------------------

No radios in mine, or autopilot -- didn't want any -- but with the studio it is easy to do in either fs2k2 and cfs 2 using the guage cfs2gps.gau you can "island hop" and not get lost (I know its cheating, but there is no radio navagation in cfs)