This is a Smiths  3  inch tachometer . Part number RVC 1433/00 for  MGB from 5/68-72 .   BMC number BHA4684. I am selling this as non working parts as it has sat around forever and I have no direct knowledge of it.  Other than the chrome bezel is nice. .The lens is not bad . Nice clean face and lettering. Includes mounting straps with no nuts. .  Overall a nice piece to work with. Shipping is gladly combined on multiple purchases to keep shipping costs as low as possible