Actually I am not sure that an analog one will work any more... from this page:
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"Note: you must always use a digital multimeter to measure oxygen sensor signals – never an old fashioned analog meter! The older meter will draw too much current from the circuit, loading-down the reading and potentially damaging the sensor. If you use a high impedance digital multimeter, there will be no problems."
hmm...
Perhaps I'll be getting that kit after all!