Thank you for choosing Aerospace-Aviation360 for Part Number 4758059 described as Engine Pressure Ratio Line Test Set. Troubleshoot Transmitter & Indicating System. (Engine Operation Is Not Required). by Mcdonnell Douglas. This is an ASAP Semiconductor owned and operated website. We are a leading supplier of aircraft tooling parts. You have 24/7 x 365 access to our diverse product database with the fastest lead times in the industry.