Not Ranked
If you have DFI (Digital Fuel Injection) and electronic ignition you will probably want some kind of scope. I finished troubleshooting a problem with a scope borrowed from work as I could not determine whether the DFI controller or the ignition controller was at fault. The scope told me that the 12V signal from the FI controller to the ignition box was present so the failure had to be in the ignition box.
I've seen low bandwidth scopes on ebay for <$100.
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