The Case-IH 1983681C1 is a genuine OEM engine speed sensor designed for precise monitoring of engine RPM in various Case-IH agricultural and construction machinery. This critical component ensures optimal engine performance and system diagnostics. It is compatible with numerous models including MXM series tractors, AFX and 2388/2588 combines, CPX cotton pickers, FX forage harvesters, and WD windrowers. This part also cross-references with New Holland part number 87303038.