Tachometer, Electric, Weston Type 545 Constellation requiring a 24v input using

requiring a 24v input using the side mounted connection

rocket detonation will be delayed after impact

so that the pointer may be set to zero at any existing atmospheric pressure between 28 and 30 inches of mercury

B-24 Liberator

25 inches diameter and ~4 inches long

Tachometer, Electric, Weston Type 545 Constellation requiring a 24v input usingHere is a WWII or pre WWII era electrical Tachometer measuring up to 2500 RPM, made by Weston. It is marked as being adjusted for series connection, so it may have been intended for a two seat trainer. It has two markers, yellow and red, along the dial scale that can be placed to indicate operating limits when installed. Measures 3. 25 inches diameter by ~2 inches deep.