BK-D Tools 3293 Spark Plug Gap Guage , Pack of 1 ReviewbP PP K-D Tools 3293 Spark Plug Gap Guage , Pack of 1 P"KD" SPARK PLUG GAP GAUGEPCircular coin-type ramp gaugePMeasures spark plug gaps from 0.020 to 0.100" (0.6 to 2.