§ 83-a. Creation of a police advisory board. Notwithstanding the provisions of section seventy of the civil service law or any other general, special or local law, rule or regulation, in any county, not wholly contained in a city, where the police agencies in such county will be consolidated, the local legislative body of such county, if the new or existing agency is a county police agency, or the local legislative body of the new agency if it be other than a county police agency, shall notify the state civil service commission who shall create a police advisory board. The purposes of such board will be to recommend to the state civil service commission the rank to which present employees would be assigned in the consolidated agency.