Gauge cluster questions

Don't bypass the ammeter at the dash since, as mentioned, the current still would route thru the bulkhead connectors which may melt it if corrosion or an upgraded alternator. Bypass it in the engine bay (many posts on MAD solution). I installed bypass diodes so my ammeter still works but higher currents get shunted straight to/from the battery (see post), but way too involved for most readers. If you don't want to tear into your dash to install a voltmeter, there are $15 cigarette lighter ones on Amazon.