Bypass ampmeter through bulkhead

I've decided to bypass the ampmeter in my 1973 plymouth duster. Using the Mad Electrical option.

Has there been any though about instead of splicing the black wire under the dash that goes to the welded slice
I typically just bolt both sides of the amp gaug connection to a single lug on the gauge. In many cases, I add a volt gauge or have the gauge converted to a volt meter.