"I would suggest double checking your numbers. If the needles still
indicate what you said, line up next to the family grocery getter to verify
you speedo is accurate. If you speedo turns out to be accurate, your tach
must be way out. These cars are notorious for having the incorrect
speedo/tack unit installed."
I have gone through the calcs myself in an effort to come up with a mental
calibration for my speedo. I know that it's way off, but I find that my
seat-of-the-pants feel for speed and moving with traffic tell me that the
tach must also be wrong. Here's what I have found: The odometer is spot on
for general use (+/-1% and only a ralliest would be concerned with that). I
found this by measuring on the interstate over 10 miles or so. Knowing
this, one could hold a steady speed for a good distance and time over that
distance. You now have an average speed to compare to the speedo reading
and could work backward through the equation to come up with an actual
engine speed. It might be too much to ask that the error in the tach and
speedo are linear, but it's a start.
Phil Barnes (peb3@cornell.edu)
Cortland, NY (nowhere near New York City)
'71 TR6 CC61193L (21 year owner)
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