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There isn't a lot in it really unless you have really specific needs.
For a 4WD, tube and fin (more so if it is a front mount) is usually better.
In a reccy 4WD the charge air load is highly...

I didn't think they dimmed?



For adjustable lighting in the gauges the back of the Dimmer is best.
Remember, the dimmer works by raising earth not dropping the 12 volt supply.
So you need to...

I got mine off the wipers and put in a switch

If you want to keep it all in the engine bay, you could switch a relay using the windscreen wiper motor ignition feed.
No need to pass anything through the firewall..