OKIE-RV8r

I'm New Here
I've reinstalled my 4371 LH mag on my O360A4M... Hooked up the "buzz" box...
My question is this- When timing the mag with the impulse coupling "LH", should you rotate the prop in the normal ditection until the impulse coupling snaps then go backwards a little and time the two mags together?? Right now I have the timing set where both lights come on at the same time which means the LH mag "snaps/light comes on" same time as the right mag.

Haven't touched the RH mag so I know timing is good...

Thanks