Quote:
Originally Posted by 1930 coupe
I have a box full of spare speedometers that I have been working on.
I have got most of them working and calibrated, I have built tools to calibrate them on the bench using cable rpm's versus MPH it is adjustable and I can check all speeds for accuracy. I have one speedometer that reads 2 or 3 MPH low at 15 and 20 MPH and 2 or 3 MPH high at 60 MPH. It is pretty close at 40 and 45 MPH. I have been playing with the magnet and spring but cannot get it
accurate at all speeds. I believe that it is a spring issue, I have loosened and tightened the spring slightly without any improvement, do I need to make larger adjustments on the spring or does the spring need replacement.
Do not tell me to send it to someone, I enjoy learning and doing all my own work, and these are spare speedometers.
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I am wondering if the pivot point is dirty just at one spot in its travel near the low end.