The P 79 is in reference to which tachometer you need. The picture given, though, seems to show P 97. (Look at the bottom of the tach in the picture.)To hitch a ride on Kloudie's post, if you need the complete panel it comes in 2 parts. Sometimes called Housing Panel and sometimes called Body Panel : # 128170 – 91010 D (2 parts : face & light box).
You also have the option of a gasket: # 128170 – 91020 and if you want the stop cable, the 3-meters (+/- 10 feet) sold under part # 104271 – 67550 is probably what you need. BTW, never heard or seen the reference to P-79 !
I ended up ordering the Body Panel : # 128170 – 91010 piece from Schooner Creek here in Portland. It was around ~$37.00. I now realize I was remiss in not ordering the gasket too (# 128170 – 91020)!The P 79 is in reference to which tachometer you need. The picture given, though, seems to show P 97. (Look at the bottom of the tach in the picture.)