Here is Ducati tachometer wiring diagram for Rotax two stroke aircraft engine. One of the things that many pilots fail to realize is that the output wires from the engine to the tachometer need to be shielded if a radio is installed on their aircraft. In addition the ignition shut off wires and the charging system wires ALSO need to be shielded.
Here is light aircraft wiring diagram of AA-5A/B Tiger Grumman American. This airplane wiring diagram is for Grumman American tiger model year 1978 until 1979. The wiring circuit diagram explain connection between starter motor, 60 amp alternator, voltage regulator, flashing beacon, left nav light, compass light, etc. Grumman American AA-5 series is a family of all-metal, 4-seat, light aircraft used for touring and training. The Tiger was the outcome of the same redesign work on the AA-5 Traveler