No, GAP insurance would not normally be accepted by a Department of Motor Vehicles as proof of insurance on a vehicle when you are going to renew your registration.
GAP is not a type of primary insurance and does not provide you any coverage if you do not have your primary physical damages insurance of collision and comprehensive and are at fault in an accident. Gap pays the different between what an insurance company would pay you if your car is declared a total loss and the balance of your loan.
State financial responsibility laws differ however in most states that require you to show proof of insurance at the time of registration and when you renew registration require you to that you have the state minimum liability requirements. What these are depends upon state laws. In many states it is bodily injury liability and property damage liability with at least the minimum limits set by the state. In other states, such as no-fault states, it may be property damage and personal injury protection (PIP) that you must show proof of to the DMV.
If you do not currently auto insurance on your car to show proof of insurance to renew your registration they you can auto insurance quotes online here with us.