fusible link question??

Where did that diagram come from?? It shows 16g whereas two other guys said to use 14g. Does it matter at that point??? I s it better to be safe than sorry?

thats the MAD ammeter bypass diagram. i recently did this to my duster and added a volt gauge. i bypassed the bulkhead connectors as well.

here is the whole artical
http://www.madelectrical.com/electricaltech/amp-gauges.shtml