Product Description
| Detail | Value |
| Part Type | Engine Governor Control Module (Electronic RPM Limiter) |
| Vintage Part | Yes (New Old Stock - NOS) |
| OEM / Interchange Number(s) | D9TZ-12A458-A (Ford) |
| Note | Used for specific fleet, industrial, or government applications to limit engine speed. Often superseded by later units like DX-49. |
| Year Range | Make | Model (Examples) | Body & Trim | Engine Size (L / CID) |
| 1979-1980s | Ford | B-Series (B-600, B-700) | School Bus Chassis | All Gas/Diesel Engines |
| 1979-1980s | Ford | F-600, F-700, F-800 Trucks | Medium Duty Commercial | All Gas/Diesel Engines |
| 1979-1980s | Ford | C-Series (C-600, C-700, C-800 Tilt Cab) | Medium Duty Commercial | All Gas/Diesel Engines |
1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989
