Need CO analyzer for motorglider tuning

The Schleicher factory uses a CO analyzer to tune the Wankel motor in
their self-launching gliders. I'd like to do it this way, as it gets a
good tuning more easily and quickly than the usual fiddling around with
the needle valves until everything is running right.

It requires a unit that can measure up to 8% CO. My problem is the
suitable units I can find are quite expensive, with the cheapest at
$2000US. These are automotive units which go to the 8% range, not the
much cheaper furnace and combustion meters that only go to 0.2% or so.

Does anyone know of a cheaper unit, or where good used ones might be
purchased? We've tried the $220 "Gastester" unit, and it is unsatisfactory.
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Eric Greenwell
Washington State
USA