There is no side-stand safety relay on an 80SG............ Only on the 82/83 Heritage Specials..........Wont affect you so don't spend to much of your time looking, lol.
Reasons i would not remove that Starter/headlight relay...... The headlight wont come on before the engine starts, less draw on the battery when using electric start..............Easy to see, pun intended, when the headlight light blows at night....................Not so easy to see when it blows in the daytime..........When ever i started my 83 Heritage bike, (80 is the same), in the daylight, i had to put my hand over the front to check if the headlight was working............The headlight safety relay also incorporates the starter cutout relay.............................The gears sound bad on the electric start, (this is normal), if the wishbone spring looses tension the gears can be damaged, this is a common happening and is an easy fix............. Removing the starter relay means every fraction of a second between the engine catching and the release of the starter button means the gears are still engaged and getting damaged............ It does matter on these bikes.
Some remove the Reserve light unit. This switches to the high/low beam if the other cuts out. Again some say get rid of it before it shits itself, and dies no good because any fool an see the headlight isn't working at night.............As long as it is working it will react to a nighttime situation faster than i could process the loss of sight and using the hi/low switch in time to be able to see my self going off the road.
RLU............unplug it, connect blue/black to blue/yellow............Just unplug the Flasher cancelling unit