Gauge Mounting Advice/Ideas

[franken]

You might want to take a minute and think about making the stock gauges work one at a time.
Oil: It's mechanical so it will probably work.
Battery: It needs two voltage sources.
Temp: If the engine isn't original, getting the right sender could be an issue.
Speedo: Typically runs off the trans.
Gas: New sender.

Or, used nongauge clusters might be had from one of the guys who part trucks. Then you can drill and mount aftermarket gauges cleanly.