Chevrolet 1993 Astro Passenger Owner's Manual page 112

Featurns & Controls
Speedometer and Odometer
Standard Cluster
Digital Cluster
Your speedometer lets you see your speed
in
both miles per hour (mph) and
kilometers per hour (km/h). Your odometer shows how far your vehicle has
been driven, in either miles (used in the US.) or kilometers (used in
Canada).
Tamper Resistant Odometer
Standard Cluster Digifal Cluster
t
PO639
Your odometer is tamper resistant. The odometer will show silver lines
between the numbers if someone tries to turn it back.
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