oldcar Posted September 23, 2009 Share Posted September 23, 2009 Hi I just this week bought this rev counter/tacho what I would like to know is what period it comes from and what it was used on? It is approx 3 1/2 diam, cable drive at an angle, offset at the base. Link to comment Share on other sites More sharing options...
Guest DeSoto Frank Posted September 23, 2009 Share Posted September 23, 2009 If you look closely at the face of the gauge, right under "R.P.M.", in tiny letters, it reads "Hundreds".This tach reads from 300 to 2400 R.P.M, with "red-line" at 2300 R.P.M.These cable-drive tachs usually connected to a special fitting on the distributor, or other connection to the camshaft.Wonder what it was used on?( took a second look at the photo - the style of the numerals makes me wonder if this was an aviation tach ?) Link to comment Share on other sites More sharing options...
Ivan Saxton Posted September 23, 2009 Share Posted September 23, 2009 Possibly WW2 military truck, like one of the big diesels that were big and weak (like a railways cup of tea) . The Hercules and Cummins of that era did not spin very freely. It does not look like one out of a tank that I remember. Link to comment Share on other sites More sharing options...
mrspeedyt Posted September 26, 2009 Share Posted September 26, 2009 diesel trucks used to run in this range at maximum. a lot of 50's thru 70's ran in the 1700 to 2100 rpm range. now a lot are programed to run 1200 to 1600 rpm and some even less! Link to comment Share on other sites More sharing options...
Guest abh3usn Posted September 27, 2009 Share Posted September 27, 2009 Possibly some off road equipment like a bulldozer or road grader. S.W. made tacs for many applications. Is there a model or part number on the gauge ? Maybe you can look that up. Link to comment Share on other sites More sharing options...
Guest prs519 Posted September 28, 2009 Share Posted September 28, 2009 I worked in the mines, and usually, with exception of trucks, the diesel engines weregoverned and had no tachs at all more often than not. As I recall 2400 was a max onsome of the earth moving scrapers (because road speed/momentum on rubber tiredvehicles can overrun governor speeds). I am sure no expert, but i would guess maybeKenworth or peterbilt over the road trucks no later than 1950 due to the stylizedSW scripting. How about marine? Link to comment Share on other sites More sharing options...
oldcar Posted September 28, 2009 Author Share Posted September 28, 2009 Looking more closely at the tach it has a "telltale" red needle behind the main pointer. it has 63900 42 cast into the diecast base so it is possibly from a military or naval engine taking that the 42 refers to the year of manufacture. Against that the rim still has traces of nickel on it. Link to comment Share on other sites More sharing options...
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