[Chrysler300] Tach rpm
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[Chrysler300] Tach rpm

Anyone know the calibration of drive cable rpm to f g h tach reading ? It appears to be 1:2 which would make sense if distributor drive into cable at distributor shaft is 1:1 ( half crank speed is at distributor) . I have one near that , another one reads about half , both have been badly attacked by the golden screwdriver .  So tach reads 1000 rpm when cable is at 500 ? 
By the way learned something new ; the bushing locating the spinning magnet wears axially , allowing the spinning magnet to physically move in toward tach face and hit the little aluminum cup driving the needle . This makes it jump up , go crazy . I thought it was centering in past causing that ( it can) and have chased that . It works great on bench, jumps in car!!  So if cable end is at all long it can press in on shaft causes the wear and the jump . Fixed one by spacer between spinning part and housing to hold it out . Was like a cut washer . Construction of these vary , not sure if by year or whatever . I would think shortening square cable end a bit if at all too long is smart too . The tiny lighting wire to needle is always broken off it seems. Very easy to do if not in there before . You do not see it . Often broken already ( pointer does not light ) seems almost impossible to fix that . Heads up , do not pull needle off shaft . I cannot figure out how they connected that wire under the dial after putting it on . Black magic or special tool ? 
If you have a good tach with lit needle , leave it alone !!
Sent from my iPhone

Posted by: John Grady <jkg@xxxxxxxxxxxxxxxxx>

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