I replaced the points with a Pertronix 1 system about 10 years ago. The tach
always bounced around for the most part with points or Pertronix. You can
adjust the stock tach by turning a pointer screw inside of the case. One of
the Tiger web sites shows the location of the adjustment screw and where you
can drill a hole in the case to get to it. You drill a hole through the case
so a screwdriver can adjust the tach while mounted. You just need a good
reference tach and match the two together at a given rpm, say 3000 rpm.
Adjusting the tach did make a difference and seems to be more accurate.
Here is a couple of helpful tach links:
http://www.classictiger.com/techtips/techtips.html
http://66.175.58.218/tech/stoa_tech_9904.pdf
Jeff
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