KTM DUKE 125 instrument cluster which connections for what?

Hello, After a minor accident, my instrument cluster (speedometer) had to be replaced because the housing was broken. The old one still works, though, and I removed the damaged housing to expose the circuit board. I thought it would look cool if I connected it to the power supply and hung it on the wall….

Why does a transformer have three secondary connections?

Oh my goodness, there was a flash in the back of the power supply. The 1A fast charger was burned out. I put in a new one. The transformer is getting primary power, but nothing is coming out the back. Because I love this power supply (I've had it forever), I want to install a…