240260280z Posted September 10, 2011 Share #13 Posted September 10, 2011 This is pretty much an educated guess: I think the 100uF cap in the circuit could be kaput and the diode/cap "tank circuit" is not working. Transients (back emf) on the tach's anemeter are not dampened correctly when going from higher rpm to lower rpm during a gear change. Link to comment Share on other sites More sharing options...
240260280z Posted September 10, 2011 Share #14 Posted September 10, 2011 OR it could be a broken spring in the needle assembly Read this great write up: http://www.classictiger.com/techtips/motach.html Link to comment Share on other sites More sharing options...
240260280 Posted January 5, 2018 Share #15 Posted January 5, 2018 73 240z Tach Circuit Schematic 1 Link to comment Share on other sites More sharing options...
jalexquijano Posted July 28, 2018 Share #16 Posted July 28, 2018 On 1/4/2018 at 8:58 PM, 240260280 said: 73 240z Tach Circuit Schematic I recenly replaced my 4 year old battery with a brand new of 600 amperes. I also changed the points and installed a petronix ignitor module and 1.5 coil. Needle seems to be bouncing or fluttering a little bit on idle in the tachometer. How do i fix this? Link to comment Share on other sites More sharing options...
Patcon
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