Thread: I am a little confused
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Old 07-11-2021   #2
TX '90 ZR1
 
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Join Date: Oct 2017
Location: TX
Posts: 2,073
Default Re: I am a little confused
You can use the HVAC controller to check the tach accuracy. Here's a page from the sticky "Solutions". Info is also in your FSM.

http://www.zr1.net/forum/showthread.php?p=144455

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