SW Tach "wandering needle"

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#1 (permalink)

06-08-2009, 01:18 PM

Dangerous Doug Dangerous Doug is offline

CC Member

Join Date: Apr 2004

Location: Scotts Valley, CA

Cobra Make, Engine: ERA 289 FIA #2108

Posts: 1,882

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SW Tach "wandering needle"

A couple of times now I've noticed my SW tach needle wandering incongruously to my engine revs.

Once I looked at it and it was happily reading 2400 rpm, when I'm thinking, "I've got to be turning close to 4000 rpms..." When I was shutting down this morning, it read 3000 rpms when I was at an idle. It wanders, then settles, and seems to work okay.

Don't tell me: Check the ground connection...

Anyone else have this with their tach?

I cant' think of anything that would have loosened any ground wires...

DD

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