thanks for info. What actually got me started on this possible engine swap in the first place was some guys on the forum (BBC) suggested that if I was going to fix the 402, I might as well do it to a 454. Just so happens I have one I can have for free along with a TH400 tranny. rsspears responded that it is possible to send the ecu out for a "clean job eliminating parts of the harness not needed or not being used. That seems to be the perfect scenario, if the cost is reasonable. should be less that buying a controller for the tranny or even the throttle body u mentioned, even though they both are possibilities. as far as using the motor home gauges, for me that is not an option because I am building a trick truck to sell. I do want the option to re-configure the dash with some new nice gauges. It might be possible to do that with the ecu and harness as is but I do not know if you can get replacement gauges that are stylish that will connect to the existing ecu harness. haven't researched that yet. I do want to keep this as simple and free of "potential bugs" in the future. Thanks a lot for your input. will check out that throttle body thing .