Found a good book about TPI's it has everything from codes to how everything works to aftermarket stuff. It's called Chevy TPI Fuel Injection Swappers Guide. It is put out by SA part # is SA53. Isbn # 1-884089-12-7. Just thought some one might find useful.

 

just to add...i ve agot a couple books that are also very helpful..."how to tune and modify chevrolet fuel injection" -ben watson, motorbooks power series and "small block chevy performance" by dave emauel, HP books...