I thought there was a processing time of a few days between adding tags tool it showed up on your account. Never payed attention when I did it with my truck and scooter. Seems like there is no problem with using ez pass on any vehicle as long as you remember to add the car!
I know in Virginia it doesn't matter if the tag is linked to an account as long as the pass works when you go through the gate. It's when it doesn't work that not having the tag linked to an account can get you a bill in the mail.
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