This paper presents a case study of improving the gas metering facilities and operation in the Indian Basin Field, New Mexico. Chevron operates 12 gas wells, each producing 3 to 6 MMSCFD, in the field. The wellhead meters, built about thirty years ago, basically consisted of 3" orifice meters with upstream out-ofplane elbows and other fittings that measured wet gas. Chevron began to examine the production and metering conditions three years ago to improve the measurement accuracy. Since the old meter piping system does not fit the specified configurations in the API 2530/A.G.A. 3 standard, the only way to ascertain the flow condition was to survey the velocity profiles inside the meter. Thus, a directional pitot probe was used to traverse the pipe and no significant swirls were observed. However, the wet gas condition and internal roughness of the old meter tubes were serious concerns. A dehydration unit was constructed to lower the moisture content of the gas and a new orifice meter with electronic measurement was installed downstream of the existing facility. A comparison of the two orifice meters showed that the wet gas measured by the old 3" meter with out-of-plane elbows was approximately 3% lower than the drier gas measured by the new meter. Possible reasons for this metering deviation are discussed in the paper.