help! correct redline tach for 69 396/325 4speed

[Mr70]

After doing some more inquiring & research,I see I was wrong & Charleys is right.
I found this paragraph in the October 1967 Motorcade while they were road testing a 1968 Caprice.

"For several months,many of us have been wondering what the different Auto makers would do to meet the new Federal Legislation on air pollution.Now that the 68's are out,this is Chevrolet's answer to the problem.
The A.I.R. Air Injection Reactor(AIR),which is an engine driven pump that admits air into the exhaust headers,is used on all engines with OPEN-ELEMENT air cleaners regardless of transmission,and on all Corvair & Corvete engines,and on all Chevy II four cylinder engines,and on all other engines with Manual transmissions.
The controlled Combustion System (CCS),which draws heated air from the exhaust to pre-heat intake air,is used with automatic transmission power teams on all other models."

I can further add that starting in 1970,due to the addition of TCS-Transmission Controlled Spark,Hydraulic lifter engines no longer required A.I.R,but all the solid lifter engines did,regardless of Transmission,even in Canada.
To Charley