I bought an EMGO for my '77 550F when the orig, OEM sw was "suspect". It mounted and plugged in exactly like the orig sw - no problem.
FWIW 'Can't find much good about EMGO ign sw's on this Forum (some good but not much). Evidently, they don't last long [?]. I haven't been into this EMGO but the contacts are said to be much smaller than in the OEM sw(which are quite husky). Some have reported the EMGO's have come apart unexpectedly.
So, I have redone the orig OEM sw (no wear or heat damage - just dried grease and corroded contacts in the plug-in connector). I'll put it back on before riding weather returns.
As it turned out, my problems were not caused by the orig OEM sw anyway. **Rather, it was because all elec connections and fuse clips needed to be cleaned - a common problem on these ol' bikes - as I learned from the great fellows on here. What would we do without them??!!