You can be the first to see my newly listed items and sales. Don't be fooled by drop shippers claiming they have these in stock. These gauges are in my possession (as are all my items). MOON Direct Mount Temp Gauge - DRY. 2 1/2 diameter gauge is designed to directly fit to a water jacket on the engine, usually on the intake manifold or cylinder head in order to read engine temperature.2-1/2" Dry, 3/8" NPT Fitting with 1 Probe.