Fits Mercruiser Inboards and Sterndrives

• 120 GM 2.5L - 153ci - 4cyl 1973-1982
• 140 GM 3.0L - 181ci - 4cyl 1973-1982
• 165 GM 4.1L - 250ci - 6cyl 1970-1982
• 228 GM 5.0L - 305ci - 8cyl 1977-1981
• 260 GM 5.7L - 350ci - 8cyl 1978-1981
• 330 GM 7.4L - 454ci - 8cyl 1977-1981
• 370 TRS GM 7.4L - 454ci - 8cyl 1978-1987
• 400 TRS (Cyclone) GM 7.4L - 454ci - 8cyl 1980-1986
• 440 TRS (Cyclone) GM 7.4L - 454ci - 8cyl 1983-1986
• 460 TRS (Cyclone) GM 7.5L - 482ci - 8cyl 1983-1986
• 898 GM 5.0L - 305ci - 8cyl 1977-1982

• Replaces Mercury No.s 78477, 78403A 2
• Replaces: MOTOROLA 8MR2023F, 8MR2024F
• 3-Wire Hook-up
• Delco Style, 10SI
• Neg. Ground
• Ignition protected
• Red Wire is for Sensor
• Black Wire is for Excitation
• One year warranty