Just returned from two weeks and used a JP Morgan Select Card (with chip and signature) at the pump at the St. Jean station with no issues. Did not ask for a pin. Inserted the card, waited for the machine and after a few seconds it told me to go ahead and pump the gas. This was when the station was closed on a weekday night. Did it more out of curiosity than need to get gas at the time.
Used the JP Morgan Select Card and some Amex (with chip and signature at a few hotels) and most times they inserted the card into the bottom of the card machine versus swiping it, and then we would sign the slip.
The process was painless.
https://www.wellsfargo.com/press/2011/20110413_EMV says Wells Fargo Visa would use the same EMV as is used across Europe and rest of the world.
The chip itself can include a number of options how it will work (it's a small computer really) so even if the technology is exactly the same, the banks may have chosen not to provide the service yet. It may even include multiple pin codes for different purposes. I'd call the bank and ask how the card works abroad and if there's something extra you need from them.
I don't remember seeing chip-and-sign cards in Europe, for example my (European) Amex has a chip and it works with a pin.
I never noticed a reader during our travels. All the cards were taken way and swiped just like in th US.



