wiring question

I seen that it is marked red below the passenger side post. Thanks for the heads up. The only concern I have is that the nut is pretty rusty and won't make good contact
Be carefull, the nuts on the back of the cir board hold the guage to the cir board.

You need a second set of nuts to tighten the terminals to the posts.

Be sure to use a backup wrench on the nuts closest to the cir board.

If you rotate the posts you can damage the ammeter.

There are no visible signs that the ammeter has gotten hot so it may be ok.

You can test it with a lightbulb and a 12v battery or power supply.

Go from positive battery post, to lightbulb to one post of the ammeter, from the other post, to the negative battery post

The guage should move one way or the other a small amount. If you use a headlight the movement will be greater