Ekectrical conundrum

[joebloggs]

I thought tach, voltage from gen but I thing some form of delay would be required or the relay would switch the circuit the min you hit the starter.

Have thought about the sidestand switch (not hit it with the grinder yet) it could provide 12v when down

Just trying to think of something other than that bloody numberplate bracket I've been messing around with since 5 am