Chevrolet 1994 Astro Passenger Owner's Manual page 113

Speedometer and Odometer
Standard Cluster
Digital Cluster
PH
Your speedometer lets you see your speed in both miles per hour (mph) and
kilometers per hour ( k d h ) . Your odometer shows how far your vehicle has
been driven, in either miles (used in the U S . ) or kilometers (used in
Canada).
Tamper Resistant Odometer
Standard Cluster
Digital Cluster
. ..
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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