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Torque Pro is the way to go. It's way cheaper, has more customization, and offers as many gauge options as any purpose built unit.
An ELM237 device is $10, Torque Pro is $5, and you can use any Android device. Just use an old phone or tablet you don't use any more and permanently mount it, or buy a new phone for $10, or a tablet for $40.
Having a tablet is nice because you can fit more gauges on it.
I have also owned 2 Ultra Gauges, and much prefer Torque.
The only downside is that the ELM237 devices never power down, so you wouldn't want to keep it plugged in on a vehicle that sits for a couple weeks without being driven. It would eventually drain the battery.
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