Good work Doug!
Until you put a hole for adjustment, there NEVER is one.
Yes, the control is VERY sensitive.. and with vibration,
it WILL change. And the top end is always the problem,
you will probably notice on hot days, it will read very
high, conversely I guess, on cold days it will read
low.. so do your drag racing on hot days so you don't
over-rev ;-)
Gary
> I got around to calibrating my tachometer today. I had expected there to be
> a rubber plug over the calibration potentiometer, but on my car, the tach
> has no opening that allows access to the adjustment.
> Fortunately, the cover came off the tach easily and I was able to remove the
> tach from the housing and calibrate it to a diagnostic tachometer. This gave
> me the chance to clean inside the lens, so now my speedo & tach are clean &
> all the other gauges look dirty.
> So, there I was, holding the innards of my tachometer in my hand while it
> was connected to the cars wiring harness with jumper wires. I felt like a
> heart surgeon.
> The adjustment is very sensitive, it takes very little turning of the
> potentiometer to make a large change in the reading.
> I set it at 3000 rpm, and so far it seems pretty close, but I did see that
> at higher rpm the diagnostic tach was reading higher then the car's tach,
> about 4150 at an indicated 4000 on the cars tach. I did not check any higher
> than 4000.This may not be a real issue, as my valve gear should be good for
> over 6000 rpm & the tach only reads to 5500.
> I hope my pistons are good to 6 grand too ;-)
> I will be out with the Tiger tomorrow for the Woodward Avenue Dream
> Cruise, are any other listers planning on being there?
>
> Happy Motoring
> Doug Leithauser
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