All States Ag Parts Electronic Ignition Kit - 12 Volt Negative Ground Ford 800 501 4110 2100 1800 2110 700 4000 NAA 600 2130 2000 8N 900 4100 Fits Ford Tractor(s) NAA, 8N (s/n 263845-later), 501, 600, 700, 800, 900, 1800, 2000, 2100, 2110, 2130, 4000, 4100, 4110 (all 4 cylinder) Voltage: 12 Volt negative ground Test results show that the Ignitor delivers twice the voltage to the spark plugs, increasing horsepower, fuel economy, and spark life No points to burn, pit, and corrode No moving or rubbing parts to wear out