---- "William C. Quincy" <wquincy@cox.net> wrote:
> P.S. the temp gauge is from a early TR4 so it's electric.
Don't forget, that means it needs the voltage stabilizer in the circuit.
Without the stabilizer it will read way high even after being "repaired".
I did my own, so no feedback on the best service to use.
Recalibrating the speedo was a fun and educational project, I'll have to write
it up some day. Basically I rigged my soldering gun as a demagnetizer (using a
bolt and some wire) to weaken the flying magnet inside the speedo. That worked
a little too well, so then I had to remagnetize it using a horseshoe
electromagnet that I quickly made from a muffler clamp, some insulated wire,
and a couple of big capacitors. Then the second time I was a little more
careful with the soldering gun degausser, and got it just right. (According to
the electronic tach I got from Harbor Freight, which may not be the best
reference.)
http://www.harborfreight.com/digital-contact-tachometer-66400.html
Randall
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