[Healeys] Tach heat sensitive?

[bspidell at comcast.net (Bob Spidell)]

Mechanical or electronic tach? 


Bob 

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

----- Original Message -----
From: "Tom" <ah3000me at gmail.com> 
To: "Healey Mail List" <healeys at autox.team.net> 
Sent: Thursday, August 18, 2011 7:43:55 AM 
Subject: [Healeys] Tach heat sensitive? 

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