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02-23-2004, 02:13 AM | #1 |
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Join Date: Oct 2003
Location: San Jose Ca.
Posts: 3,335
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Calibrating a factory tac
Is it possible to calibrate a factory tac? Mine is sitting at -200 when the truck is off.
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02-23-2004, 02:47 AM | #2 |
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Join Date: May 2000
Location: Petrolia,Ontario,Canada but working in Port Huron,Mi.
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Where does it sit when the ign is on but eng. not started?
It should be at zero then. If it still needs "tweeking" there is a small hole in the back of the tach(it may be covered with some type of sticker). Peel that off.You'll see where you can adjust it there.
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71 blazer,350SBC,approx.375HP,700R4,factory GM TPI.Dual electric fans,33x12.5x15 ATR on stock suspension. Petrolia,Ontario,Canada but working in Port Huron,MI. See ALL my Blazer pic's HERE Last edited by BobbyK; 02-23-2004 at 08:21 AM. |
02-23-2004, 03:47 AM | #3 |
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Join Date: Oct 2003
Location: San Jose Ca.
Posts: 3,335
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It sits at -200 when ign is on but not started.
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02-23-2004, 08:24 AM | #4 |
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Join Date: May 2000
Location: Petrolia,Ontario,Canada but working in Port Huron,Mi.
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Try adjusting it as descibed while eng is running.
If you have access to an external tach,test tach or the like,hook that up and use that as well. You can compare the external tach readings with the indash one and see if they are close to each other.
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71 blazer,350SBC,approx.375HP,700R4,factory GM TPI.Dual electric fans,33x12.5x15 ATR on stock suspension. Petrolia,Ontario,Canada but working in Port Huron,MI. See ALL my Blazer pic's HERE |
02-23-2004, 08:27 AM | #5 |
Registered User
Join Date: May 2000
Location: Petrolia,Ontario,Canada but working in Port Huron,Mi.
Posts: 1,771
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Here's a pic I found on this board.The hole at the top of the gauge is where you would adjust it.
__________________
71 blazer,350SBC,approx.375HP,700R4,factory GM TPI.Dual electric fans,33x12.5x15 ATR on stock suspension. Petrolia,Ontario,Canada but working in Port Huron,MI. See ALL my Blazer pic's HERE |
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