The Lieutenant Governor shall possess the same qualifications of eligibility for the office as the Governor. He shall be President of the Senate, but shall have only a casting vote therein in case of a tie vote. If during a vacancy of the office of Governor, the Lieutenant Governor shall be impeached, displaced, resign, die, or become incapable of performing the duties of his office or be absent from the State, the President of the Senate shall act as Governor until the vacancy be filled or the disability shall cease; and if the President of the Senate for any of the above causes shall become incapable of performing the duties pertaining to the office of Governor, the Speaker of the Assembly shall act as Governor until the vacancy be filled or the disability shall cease.