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I'm sure this question has been asked before and I've looked everywhere I can think of to find the answer. Since I didn't have any luck I am posting pictures of my tachometer face and the rear bearing the date stamp. It doesn't seem right to me because I recently bought a reprinted 68 owners manual and the tach that I have doesn't jive with the manual. To begin with, the car is a 68 convertible and has a January 3, 68 build date according to the trim tag. I bought the car completely disassembled. It's impossible to tell if it was originally a big block because the original frame is missing. The front clip still has the hanger for the windshield washer bag if that means anything. I can't figure this out and hope someone can shed some light on this. Thanks in advance.
To me it looks like you have a 6000 RPM red line tach used with the 350 HP engine.
The printing registry of the tach zones on the face isn't the greatest, but they never made a Corvette with a 6050 red line.
John
According to the manual;
" Three different tachometers are used in the Corvette, depending upon the engine option installed in the vehicle. The Corvette 300 HP engine is equipped with a tachometer which has a yellow zone from 5000 to 5300 RPM ( indicating valve float area) , and a fire orange zone from 5300-7000 (indicating danger zone).
The 350, 390 and 400 HP engines are equipped with a tachometer which has a yellow zone from 5300 to 5600 rpm and the red zone from 5600 to 7000 rpm.
The tachometer supplied with the 435 hp engine has a yellow zone from 6300 to 6500. Don't permit the pointer to enter the red zone beyond 6500."
So, the one that I have is none of these? Very strange indeed.
" Three different tachometers are used in the Corvette, depending upon the engine option installed in the vehicle. The Corvette 300 HP engine is equipped with a tachometer which has a yellow zone from 5000 to 5300 RPM ( indicating valve float area) , and a fire orange zone from 5300-7000 (indicating danger zone).
The 350, 390 and 400 HP engines are equipped with a tachometer which has a yellow zone from 5300 to 5600 rpm and the red zone from 5600 to 7000 rpm.
The tachometer supplied with the 435 hp engine has a yellow zone from 6300 to 6500. Don't permit the pointer to enter the red zone beyond 6500."
So, the one that I have is none of these? Very strange indeed.
Your owners manual has a misprint. Below is a scan from my 1968 second edition owners manual that has the correct yellow and red zones for all the engines.
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68 tachometer
