Can anybody provide real information on TPMS on the 2008 altima. I replaced all the sensors using aftermarket 40700-JA01B type sensors. Some Internet sources state I need an activation tool applied to each sensor to first activate the sensor. Other sources say to ground out the white TPMS wire under the dash 6 times to put the Altima in learning mode while each tire is inflated to different pressures, then drive the car for 10 minutes. Still other sources say I need both a tool to activate the sensor then another tool (or the same $$$$ tool) connected to the OBD port.

Any real help would greatly be appreciated.