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05-15-2002, 03:03 PM
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#1 |
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Registered User
Join Date: May 2002
Location: lexington,South Carolina
Posts: 158
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Factory Tach Problems
Does anyone know where I can get my factory tach calibrated. It reads correct at idle but after that it is about 1000rpm over actual rpm. I have installed a HEI dist. would that be affecting it?
------------------ 69-C10 LWB
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69-C10 LWB 71- fleetside shortbed It's a shame stupidity isn't painful Never play leapfrog with a unicorn |
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05-15-2002, 03:07 PM
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#2 |
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Binder Rep
Join Date: Jan 2001
Location: Salcha, AK
Posts: 1,506
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did the tach come from a 6 cyl truck?
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05-15-2002, 03:12 PM
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#3 |
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Registered User
Join Date: May 2002
Location: lexington,South Carolina
Posts: 158
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I don't know I bought the whole instrument pannel at a swap meet. If it is can it be recalibrated?
------------------ 69-C10 LWB
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69-C10 LWB 71- fleetside shortbed It's a shame stupidity isn't painful Never play leapfrog with a unicorn |
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05-15-2002, 03:44 PM
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#4 |
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Registered User
Join Date: Dec 1999
Location: Old Mission, MI, USA
Posts: 2,510
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These tachs are notoriously inaccurate. There is a screw on the back where you can adjust it. HEI will have some effect, but most of them are not accurate with points either.
------------------ Tim
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Tim |
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05-15-2002, 03:53 PM
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#5 |
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Senior Member
Join Date: Dec 2000
Location: Indiana
Posts: 3,074
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You can calibrate any factory tach, 6 or 8 cylinder tach with the calibration screw on the back of the tach. You will need another tach to compare to when you adjusting it.
I recalibrated my factory 6cyl tach against an aftermarket tach, on my 71 with HEI & V8. Works perfect. ------------------
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71 Chevy CST Long Fleet 350/350/3.07 leaf rear. |
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05-15-2002, 04:35 PM
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#6 |
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Registered User
Join Date: Aug 2001
Location: escondido, ca 92026
Posts: 1,222
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this is the tach adjustment screw....
 ------------------ '72 short step, 350, 700R4, tilt, ps, pdb, a/c, lowered coils, etc., other work in progress... San Diego, CA http://www.ixpres.com/vlusardi/chevtrk.htm [This message has been edited by bigvinnie (edited May 15, 2002).] [This message has been edited by bigvinnie (edited May 15, 2002).] [This message has been edited by bigvinnie (edited May 15, 2002).]
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'72 short step, 350, 700R4, tilt, ps, pdb, a/c, lowered coils, etc., other work in progress... San Diego, CA 72 Stepside Project |
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