1) Tach or spark plug inductive trigger. Well both really; connect around spark plug wire, and when that big Kv spike blasts through, it's interpreted by the display unit as either a "trigger" to use as a reference (ie: timing light or scope), or as indicator of "1" unit of spark, over timescale "X" (ie tachometer).
2) Looks too small to be a drum spring tool. Maybe for the smaller springs. My gut says adjustable headlamp spring puller. Could also be a wire puller, to pull a wire through an obscured hole. Most of those are longer with flexible shafts.
3) I'd need more pictures.