[Healeys] Tach heat sensitive?

[Bob Spidell]

My BJ8's tach did the same (though not quite as extreme). After I calibrated it it has been spot on at all temps and speeds. 

Bob 

-------------------------------- 
Bob Spidell - San Jose, CA 

----- Original Message -----


It's in my BJ8, so it's electrical. 


Yup, overdrive on at 65mph. 


- Tom 


On Thu, Aug 18, 2011 at 11:44 AM, Bob Spidell < bspidell at comcast.net > wrote: 




Mechanical or electronic tach? 


Bob 

-------------------------------- 
Bob Spidell - San Jose, CA 






I've noticed that when I drive to work in the morning when it's cool 
(50-60F), my tach shows about 2500 RPM at 65 MPH. When I return home at 
night when it's warm (80+ F), my tach shows about 3000 RPM at 65 MPH. 

Any ideas about what's going on? 

thanks, 

Tom