We don't typical reverse engineer anything - we design everything from the ground up. We do all of our engineering and manufacturing in house so we can make small quantities of products at decent prices. What exactly are you looking to do? We currently have a module that uses both TPS and RPM signals to do two step and "speed shift" features. Assuming we could use that circuit board to accomplish what you need the price would be surprisingly low. If a custom board has to be made then obviously the cost will go up quickly as there is much more engineering and manufacturing costs associated with a custom low quantity board.