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Something to think about when getting additional senders is the length. Autometer makes two styles one is the 2258 and the other is 2259.
The 2258 is the standard supplied with most temp gauges, but it has a longer probe.
The 2259 is a shorter version, that will not impede the flow as much. I know where I installed my cooler probe, I needed the 2259 to keep it from blocking flow in the filter head.
Both will read the same and are interchangeable per Autometer.
I have been thinking of the rotary switch. Right now I can toggle my trans and rear diff using the simple two position switch. I could add two positions in a rotary for engine oil and transfer case I guess.
I bought one when I was doing mine, but just couldn't get it to fit in the pod, so I went the other route. I was thinking about doing the Diff's and T-Case as well as pre-cooler temps. The senders are cheap so not a big deal to install them.
Take a look at this one 56D36-01-1-AJN nothing special but offers 10 positions, Digi-Key sells it for around $12.