DIGITAL DIAL INDICATOR AND ADAPTOR https://www.agskartparts.com.au/products/3226/digital-dial-indicator-and-adaptor
METRIC/IMPERIAL DIGITAL DIAL INDICATOR AND ADAPTOR TO FIT 14mm SPARK PLUG HOLE TO ADJUST IGNITION TIMING [8MM DIAL BODY DIA. 2.5MM END THREAD EXTENSION LENDTH 81MM ]