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Mechanical Tach

dk1977

Well-known member
Joined
Oct 5, 2004
Messages
77
Location
Trinity, TX
Corvette
1977 White Coupe
I bought a lower left hand dash pad with the speedo and tach at a swap meet. The tach is mechanical. Any one know how to tell the year model? I can find no obvious part numbers. The speedo is a 160 mph. What was the last year for mechanical tachs?
 

dk1977

Well-known member
Joined
Oct 5, 2004
Messages
77
Location
Trinity, TX
Corvette
1977 White Coupe
The numerals are white, the orange line begins at 5000 and the redline begins at about 5300.
 
B

bmotojoe

Guest
I can’t be too much help on the tachometer other then I know that the later 70’s (and maybe early 70’s) L-48 and L-82 equipped Corvettes were different. The L-48 red lined at 5,300rpm where the L-82 red lined at 5,600rpm. As far as the speedometer head part numbers are as follows:
1969 - 1974 6496850
1975 - 1976 8987282
1977 (Only) 25015662
1978 - 1979 (Early) 25016830 Canada - 25016832
1979 (Late) - 1981 25024090
Also the attached picture is of the differences between them from 1969 – 1977
Brian
 

Evolution1980

Well-known member
Administrator
Joined
Feb 25, 2002
Messages
4,302
Location
Cleveland, Ohio
Corvette
ZZ4, 700R4, Steeroids rack & pinion, VB&P Brakes
I believe the LT-1's also had it's own special tach due to the differences in the engine redline (due to the solid lifters and such).
 

6880 Mike

Well-known member
Joined
Jun 30, 2006
Messages
2,723
Location
The Bluegrass State
Corvette
1968 convertible; 1980 L-82
It ought to have a tag with a GM part number on the back of it. Post the part number. Based on the red lines, it's a standard L-48 tach.

:)
 

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