I have a triton d10 snapon scanner with a 2 channel scope. I'm learning my scope with this page. But my question is can you use a 2 channel scope to show you the firing of all cylinders with single set up
I assume you are wanting to see ignition events for all cylinders?
In an old car with a distributor you can obtain a secondary ignition voltage trace for all cylinders on a single channel by placing a secondary probe on the coil wire that feeds the distributor.
On distributorless ignition engines, you can view the current ramp of all the ignition coils by placing a fused loop in place of the fuse for the ignition coils and attaching a low amp clamp to the loop.
You will not be able to the secondary voltage of all the coils firing on one channel unless you make some kind of daisy chained secondary pick up that you can lay on all of the ignition coils at once, and that's assuming that theoretically all the coils are easy to reach and not so shielded that they are impervious to secondary testing.