Amp gauge needle now facing upside down on my SS

[XXXGoldL34M20]

My Horns did not work earlier this week on my 70 Chevelle SS so i took the original 890 horn relay off for a good clean up inside.
The relay just needed a good clean up and some gentle sand paper scuffed along the 2 contacts under the cover.
The Buzzer now screams and the horns work like they should.

The next problem though was when i looked at the Amp Needle on the SS gauges it was pointing to the 6 o'clock position instead of the 12 o'clock position [img]<<GRAEMLIN_URL>>/frown.gif[/img] .
When i turn the car on the gauge still works but it moves in the upside down position.

A friend of mine told me if i grab a 1.5 volt AA battery and touch the contacts of the back of the gauge that it may bring the needle back to its proper position?
I even herd that it may go back eventually on it's own.
Any opinions on what to do before i start taking the dash apart?