I would greatly appreciate some advise to help me choose between the 2-channel and 4-channel Picoscope Automotive kits.
As I am a complete beginner in the use of oscillopscopes for automotive testing, I have no idea if I would restrict myself by purchasing the 2-channel scope instead of the 4-channel.
If there are meaningful Automotive tests which need 4-channels, then I would choose for the 4-channel scope.
You can get the job done with two channels. However, it may take a bit longer and there are some limitations.
If you were to add a Mixmaster ignition mixer for capturing waste spark secondary ignition, using a two channel, you would have to choose between splitting the banks by polarity between two channels or trigger. To split banks and trigger requires three channels.