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Gauge package and tachometer applications are as follows for 1973 to 1987 light duty models only (excluding special editions in this discussion):
Standard instrumentation included speedometer/odometer, fuel guage, generator warning light, oil pressure warning light, engine temperature warning light. Standard on all years and models EXCEPT FOR 1973-1974 YE9 Cheyenne Super/Sierra Grande and 1975-1987 Silverado/Sierra Classic models.
Optional Z53 guage package replaced replaced the generator, oil pressure, and engine temp warning lights included with the standard instrumentation packages above with ammeter (1973-1975) or voltmeter (1976-1987), oil pressure, and engine temperature guages. This package was optional with all trim levels, except for the 1973-1974 YE9 Cheyenne Super/Sierra Grande and 1975-1987 Silverado/Sierra Classic models, where it was standard.
Optional U35 electric clock available on all 1973-1987 models but required purchase of Z53 guage package where not standard. Could not be ordered in conjuction with optional U16 tachometer.
Optional U16 tachometer available on all 1973-1981 models but required purchase of Z53 guage package where not standard. Could not be ordered in conjuction with optional U35 electric clock. ALSO: this tachometer option continued to be available on all 1982-1987 models, but ONLY AS A SPECIAL EQUIPMENT ORDER OPTION. (This fact is noted only in Data Books and NOT in brochures.)
Ken
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