I just installed the module from Summit racing. With the car on a rack it does not take more than a minute to do the mod. Just snap off the solenoid connector (female)insert the new male plug, then, place the new female plug into the existing module on the tranny. If you just disconnect the solenoid connector, it is possible you will get a continual error message.
Just a side note, when I ordered the kit from Summit, I indicated Viper in the order form. The unit is actually listed for a Transam of Camaro. They called the following week to see if the unit worked - it does (29.95)