Gauge package with tachometer and trip odometer

Years 1982–88 Models 5 Factory citations 12

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Also described as Gage package, with tachometerInstrumentation, specialGauge package with tachometer

Also documented for Pontiac

Documented applications

Camaro — Gen 3 (1982–1992)

1982–1987 Factory-verified

the 1982 and 1983 guides name it special instrumentation (tachometer, voltmeter, oil and temperature gages, trip odometer)

GM Heritage factory kit — 1982 Chevrolet Camaro, p.30.
GM Heritage factory kit — 1983 Chevrolet Camaro, p.41.
GM Heritage factory kit — 1984 Chevrolet Camaro, p.4.
GM Heritage factory kit — 1985 Chevrolet Camaro, p.22.
GM Heritage factory kit — 1986 Chevrolet Camaro, p.22.
GM Heritage factory kit — 1987 Chevrolet Camaro, p.15.

Cavalier — first generation (1982–1987)

1984, 1986 Factory-verified

the 1985 line prints U2T, so 1985 is left out

GM Heritage factory kit — 1984 Chevrolet Cavalier, p.9.
GM Heritage factory kit — 1986 Chevrolet Cavalier, p.38.

Cavalier — second generation (1988–1994)

1988 Factory-verified

the 1988 page prints U21 on its tachometer line

GM Heritage factory kit — 1988 Chevrolet Cavalier, p.32.

Citation — X-body (1983–1985)

1984–1985 Factory-verified

1984: requires LH7; 1985: requires LB6

GM Heritage factory kit — 1984 Chevrolet Citation, p.35.
GM Heritage factory kit — 1985 Chevrolet Citation, p.34.

Corsica — L-body (1987–1996)

1988 Factory-verified

cavalier-gen2 reads U21 as "Gauge package with tachometer and trip odometer"

GM Heritage factory kit — 1988 Chevrolet Corsica, p.33.

This page aggregates every documented appearance of U21 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.