Thread adaptor for the Gunson Hi-Gauge Compression Tester, Part No. G4101 & Gunson Colortune, Part No. TECHNICAL DETAILS A 14mm to 10mm thread adaptor that converts the standard connectors supplied with the Gunson Colortune and Hi-Gauge compression testers to fit the smaller spark plug sockets commonly found in classic motorcycles and two-stroke engines.
eBay