The Thexton 421 Crankshaft Camshaft Sensor Alignment Gauges are essential tools for aligning sensors on GM 3.0, 3.3, and 3.8 engines. Made in the United States, this set includes three units to ensure precise alignment. With a simple design and easy-to-use instructions, these gauges are a must-have for any automotive technician looking to optimize engine performance. The California Prop 65 Warning reminds users of potential health risks associated with the product. Exact item set is shown. Vintage new old stock with original packaging. Made in USA. No returns on installed items or partial sets. Please review our business policies in our store for information regarding returns, shipping and warranties.