Sounds heat-related. I see from the schematic there's a there's a thermistor in
the tach circuit; it could be post toastie.
Just a SWAG.
Bob
--------------------------------
Bob Spidell - San Jose, CA
----- Original Message -----
From: "Bob Johnson" <bjsbj8 at gmail.com>
To: "Healeys" <healeys at autox.team.net>
Sent: Friday, September 9, 2011 10:58:00 AM
Subject: [Healeys] Tach way off
Using my digital tach to set the tach in the car, they line up really
well.both agree at 3500rpm and are close otherwise. However when c driving,
according to the chart I have, at 60mph, 4th od, rpms s/b 2550. Tach reads
5200. Anyone have any ideas. Moma rebuilt it about 5000 miles ago. Its never
been right on, but this is ridiculous. I use gps as speedo. A really neat
app from android market called ulysse speedometer. Even has hud display.
Bob Johnson
BJ8
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