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Hi.
Very cute mouse -- not the commensal vermin, Mus musculus or House mouse (note the fuzzy tail with an edge revealing a white underside), but most likely some variety of native "deer mouse" or "white-footed mouse" (Peromyscus sp.), in grey immature pelage (adults are a reddish brown), that I can't identify further from that angle of view.
Anyway, first, that indoor/outdoor/voltage thing that you're illustrating has been widely sold by various companies over, I'd say, about 15 or 20 years -- even Radio Shack sold them for a time -- I've still got that in my '84, still working (the little AAA batteries last about 2 years at a time.
And I'm glad you know enough to be very cautious about bringing so much amperage into the passenger compartment for such an ammeter -- not to mention that you're adding resistance that reduces (hopefully just a little) output to the battery. For readers emulating your dashboard ammeter, the safer way to do that is to use an ammeter that includes an external shunt -- the shunt remains out in the engine compartment and only light gauge wires (carrying miniscule current) from the shunt have to be lead to the gauge body in the dashboard.
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