Read all of this. http://www.shiftworks.com/flash/amp-gauge.swf Piece of cake.
M.A.D. likes to use big bulkhead mount terminal blocks. This is a good idea. It allows for less termination and is an excellent way to change from big wire to small wire. You probably have the printed circuit type gauge panel.
They have always had the opinion that a volt gauge is better than an ammeter.


Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn