This is my first post to this board so I would first like to say thanks to all the knowledgeable people out there who have contributed. I am starting a GM tbi conversion on my 94 ski nautique boat (351W). Here is my question. I have access to a free 16168625 pcm with harness TB and all sensors. Or I can purchase a 1227747 ecm and all needed items at the local JY for around $250. Is it worth trying to tune around the lack of VSS signal in a boat or should I stick with the 1227747 set up for simplicity. Just for the record I'm new to the tuning process it will all be a learning curve. Thanks in advance for any help I may receive.
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