State officer or employee under civil service appointed to another office by Governor; salary and rights under civil service continued

When any person holds office, position or employment under the government of this State and has tenure or is protected in such office, position or employment by virtue of any law or any order, rule or regulation of the Civil Service Commission, and such person shall be appointed to any office by the Governor, by and with the advice and consent of the Senate, such person shall continue to hold the said office, position or employment in which he has tenure or is protected and shall continue to receive the salary or compensation provided for such office, position or employment and shall retain all the rights, privileges and benefits incident to his continued holding of said office, position or employment and his rating and status in the State Civil Service, despite the fact that he accepts and qualifies for the office to which he has been so appointed by the Governor; provided, the Governor certifies his approval thereof in writing to the Civil Service Commission; and in such case such person shall receive, in addition, from the appropriation made for salary or compensation for the office to which he has been so appointed by the Governor such additional salary or compensation, not exceeding twenty-five hundred dollars ($2,500.00), as the Governor, in his discretion, may fix by his certificate, which certificate shall be filed with the Civil Service Commission.