Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4CT3A-5 found under Indicator Electrical Tachometer by Westberg Mfg Inc. The National Stock Number assigned to this part is 6620014905664, 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 4CT3A-5.