1. 

   AliK

   Z Club Member

   Staff Member Moderator

   Does anybody know if this is the adjustment / calibration screw on the back of a 260z rev counter?
   
   Mine is consistently 10% optimistic across the range and I'd like to get it bob on if possible.
   
   

    

   AliK, Apr 15, 2019 at 3:24 PM

   #1
2. 

   jonbills

   ZClub Administrator

   Staff Member Moderator

   Dunno, but I found mine also reads about 10% over at idle.
   Twiddle it and see what happens....

    

   jonbills, Apr 15, 2019 at 4:17 PM

   #2
3. 

   Mr Tenno

   ZClub Administrator

   Staff Member Moderator

   Looks like there are adjustment screws on the 240 / 280 so the 260 should have one too: https://www.classiczcars.com/forums/topic/50506-tach-reading-faster-than-tachdwell-meter/

    

   Mr Tenno, Apr 15, 2019 at 5:02 PM

   #3
4. 

   AliK

   Z Club Member

   Staff Member Moderator

   Thanks fellas - will have to geek out on that properly when I next have a few quiet moments. When I figure this one out I will post back.
   
   JB - mine is consistently 10% over all around the rev range.
   
   Bizarrely though, my speedo is 15% pessimistic at 30 but gets accurate at 90 (on the track of course)!
   
   That one I defo need to deal with as an indicated 30 is more like 35ish and indicated 50 on the motorway roadworks is closer to 60!

    

   AliK, Apr 15, 2019 at 9:35 PM

   #4

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