[panhead_pete]

Sorry fellas feeling a tad vague are the speedos common to 77FLH/84FXWG/85FXWG?

 

[Mr Bill]

2:1
47 - 67 FL transmission drive
73 - 90 XL, FX, FXR (except softail & 4 speed FXWG) f.wheel drive

1:1
68 - 83 FL, FX 4 speed transmission drive

2240:60
84 - 90 softail, 4 speed FXWG, 4 speed FL, f.wheel drive

Specific to your question:
'77 FLH is 1:1 transmission drive
'84/'85 FXWG is 2240:60 front wheel drive

 

[panhead_pete]

Thanks!!