PERFORMAX OIL PAN ADAPTOR FITTING 1/2" X 20 UNF W/WASHER - R78899 - ISSPRO has been associated with instrumentation for heavy duty diesels since 1949. Our new PERFORMAX line was created especially for the diesel performance customer. ISSPRO'S PERFORMAX system includes: Stepper motor gauges with LED lighting - Heavy duty Electronic Signal Processor (ESP) - New high accuracy ISSPRO sensors