Ultimate High Output Replacement Coil. Replaces stock factory Tci ignition coils.12 Volt. Primary resistance 2.45 OHMs. Secondary resistance 15ak OHMs 6.6mm mounting holes spaced at 102mm (4") mounting holes center to centerWarning: Serious High Voltage Possible Output as high as 82 KvCaution! Do not operate or apply power to the ignition system with one or both spark plugs disconnected. Do not leave the ignition on with the engine not running. Warranty is void if operated with one or both spark plugs disconnected or if the ignition is left on with the engine not running.