74 Dart sport 5.9 Magnum swap

So I'm doing a magnum swap running factory ECU and harness from a 97 Ram. I will be running my factory 727 trans from the dart and I know I need a VSS from a late 80's truck. So here is my question, If the computer isn't seeing data from the other trans sensors that were in the truck will it put it in limp mode? I know it will set the check engine light. Any info would be greatly appreciated.