A. I haven't (yet) made a whole harness from scratch for a Virago myself. But two bikers, 'Scotsman' and 'Starcove' have offered their wiring diagrams for our use.  If you use these diagrams, neither they, nor I, can be held responsible for anything that happens to any electrical components of your bike.
Additional Information: 'Starcove' said there is a mistake on his sketch. The black/white wire from the TCI to ground is incorrect; that b/w wire has to remain open (probably just capped off)

Starcove's schematic,  
Scotsman's 1986 XV700 schematic.