Quite Possibly The Most Critical Vital To Monitor Engine Oil Pressure Can Mean The Difference Between Making It Home And Needing To Replace The Engine. The Patented Air Core Meter Movement Provides The Durability And Accuracy That You Expect From The Autometer Name. Throughout 57 Years Of Building The Worlds Best Competition Instruments This Meter Movement Has Been The Engine Powering The Machine That Sets The Benchmark. A Single Wire 1/8" Npt Oil Pressure Sender Is Included.