![Early Spark Plug Reference Chart? - Technical - Antique Automobile Club of America - Discussion Forums Early Spark Plug Reference Chart? - Technical - Antique Automobile Club of America - Discussion Forums](https://content.invisioncic.com/r277599/monthly_2020_10/ad_02.jpg.96267350cde134cc638a6c79e42cf5b8.jpg)
Early Spark Plug Reference Chart? - Technical - Antique Automobile Club of America - Discussion Forums
![Amazon.com: Performance Tool W3204 Spark Plug Gauge - Easy to Read Markings, Range 0.020-0.100 in (0.5-2.5mm), Tapered Hold, Small Fishbowl : Automotive Amazon.com: Performance Tool W3204 Spark Plug Gauge - Easy to Read Markings, Range 0.020-0.100 in (0.5-2.5mm), Tapered Hold, Small Fishbowl : Automotive](https://m.media-amazon.com/images/I/81MaaVuYgqL._AC_UF894,1000_QL80_.jpg)
Amazon.com: Performance Tool W3204 Spark Plug Gauge - Easy to Read Markings, Range 0.020-0.100 in (0.5-2.5mm), Tapered Hold, Small Fishbowl : Automotive
![Amazon.com: Powtol (Pack of 2) RJ19LM Spark Plug for Briggs & Stratton 796112 802592 5095K Champion J19LM (868) : Patio, Lawn & Garden Amazon.com: Powtol (Pack of 2) RJ19LM Spark Plug for Briggs & Stratton 796112 802592 5095K Champion J19LM (868) : Patio, Lawn & Garden](https://m.media-amazon.com/images/I/61YF3aYCVTL._AC_UF894,1000_QL80_.jpg)