Speed sensor calibration

[ko0t3rskkar]

I need some ideas for how difficult this will be. I just swapped in a manual tranny, it uses a different speed sensor than the old tranny did. Im told that the ECM will need to be modified in order for the new speed sensor to work correctly. How difficult would it be to do this? Prices? Or could I just grab a chip out of another car with the same engine and tranny?
Thanks in advance.