If you add a pin to the PCM plug for the VSS it will work like it did from the factory. Buy a reverse lockout plug (off of EBAY), wire it IGN power on one side and add a pin from the PCM for the other. I bought a few pre crimped wires (with PCM ends already crimped on from Speartech. Works great. You have to have the VSS plugged in to the trans for it to work though. The PCM provides the ground signal. PCM connector #3 pin 8.
http://www.pcmofnc.com/install/E67%20Pin%20Install.pdf