Originally Posted by Joseph Davis

Voltage dividers suck. If the load changes, so does the voltage division. Works great in a voltage divider bias circuit as it plays off a transistor, but in and of itself it's a joke of an idea.

Used to tweak the output of the MAP sensor, it would do OK as filetofit/Chris has proven on HT... the ECU itself is fixed load, so you can dial in th correct division. If you think it's an idea you can apply widely you need to pick up a book on basic electronics and learn basic ohms/kirchoff's law.