The temperature sending unit screws into the side of the cylinder block or on the intake manifold and allows the temperature gauge to function properly. This OER® Authorized reproduction is produced using the correct button-style terminal end with the correct housing and resistance for accurate temperature gauge reading. 1/2 x 14 NPTF. Made in USA The OER® Authorized logo represents products that meet or exceed stringent OER® quality control standards. This item has been sanctioned and approved by OER®.