allanhurst:
Then your meter is faulty - see my post 26
I have another of the exact same gauge which exhibits the exact same behavior, even though it's only been tested once with R2 in place, so had no potential for overcurrent. I don't think the gauges are damaged as they both climb from 0 - 3000 when I used the other transistor, no R2 and the tone() function. However the only way I've gotten it over 3000 is to lower the R1 value which seems to destabilized/slow short the circuit.