We have new MEFI 4B ECU's to upgrade the older MEFI 1,2,3 ECU's. Mefi 4B ECU's are Marine grade to withstand harsh envioroments, high shock loads and wet conditions.
Re-pining the J1 & J2 wiring harness connectors is necessary. Included is the pin-out conversion chart (optional J1 & J2 connectors are avilable).
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