Jet II, there are no limits on vibration, there is no amber or red line.
Yes the auto popup of the secondary engine instruments will occur at 4.0units.
Boeing does not publish AVM procedures on EICAS equipped airplanes unless the engine manufacturers provide "hard" AVM limits. Boeing recommends that the AVM system be used for long term engine condition trend monitoring. This can be accomplished by the flight crew recording the AVM values in the airplane log book during stabilised cruiser by automatic recording as appropriate.
In line with the above, flight crews in the absence of published AVM procedures, not to shutdown engine/s based solely on high AVM indications. However, high AVM indications combined with other abnormal engine indications, extreme vibrations, severe damage, and/or engine limit exceedances should be addressed in accordance with the appropriate non-normal checklist.