Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number IC4BRN4X5A9N found under Indicator Electrical Tachometer by The Electric Tachometer Corp. The National Stock Number assigned to this part is 6620000539568, and the Federal Supply Class is 6620 Engine Instruments. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like IC4BRN4X5A9N.