I see some challenges using a 16168625 PCM for a Marine Carburetor to a Marine TBI conversion. Usually the 1227747 ECM is the Marine TBI computer of choice. The 1227747 has a park switch input, which eliminates the need for a Vehicle Speed Sensor. Setting the 1227747 park switch to Ground (battery -) tells the 1227747 the vehicle is in park. The 1227747 will operate an engine when the 1227747 thinks the engine is in park.

The 16168625 does not a simple park switch input. It might be possible to configure the transmission gear position inputs of the 16168625 to indicate park. (That's something I have not tried to do) The 16168625 uses Vehicle Speed input to select near idle or off idle fuel and spark tables. It might be possible to configure the vehicle speed parameters along with the TPS% parameters to "lock" the 16168625 into using the Off Idle fuel and spark tables only?

I'm sure a Marine engine would run with a 16168625 without a Vehicle Speed input, I'm just not sure how well the engine would run? Perhaps there is a way to have a GPS supply the 16168625 with a vehicle speed input?

dave w