Stewart Warner RPM id

[David Perrott]

Hi all , need to id a couple of tachos i picked up recently , made by Stewart Warner 3 to 2500 rpm , from 21 to 2500 rpm is marked in red , has the number 424 CH N6 stamped onto case in ink and the number 63900 cast in the rpm cable drive stem , olive drab rim with a u clamp and 2 wing nuts to lock into dash.

cheers dave

[gordon]

I remember the 2100 red line area would be typical for something like a Diamond T, which ad a plate warning of engine damage if that limit was exceeded for any length of time.

Does it have a resettable warning pointer on it?

[David Perrott]

Hi Gordon , yes it does.

cheers dave

[gordon]

From memory, I've seen it on the Diamond T 4 ton 6 x 6, the Mack NM series, and the DUKW - not sure where the red line was on the DUKW though.

[motto]

DUKW red line is 2750 RPM.

David

[Ian Fawbert]

Hi Dave,

Can't help ID it, but thought you might find this site interesting regarding the numbers you posted.

The N6 is the date code, N:1945, 6:june

http://www.ruiter.ca/mc/info/SWSpeedoDating.html

Cheers,
Ian.