1. Sure, measure resistance between black-wire connector at left-coil to other end of that wire at cluster connector.
2. Would also need to measure resistance of segment between cluster connector to tach circuit-board itself.
3. Then there's signal itself on that wire. Would need oscilloscope to inspect that signal. Should look something like this with logic high most of the time with grounding drops to fire coil.
Also look at circuit board of tach for ballooned or blown capacitors.