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  Is factory tach adjustable?

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Author Topic:   Is factory tach adjustable?
cecil671
Journeyman

Posts: 21
From: Newport,TN.USA
Registered: Jun 2003

posted 01-05-2004 09:56 PM     Click Here to See the Profile for cecil671   Click Here to Email cecil671     Edit/Delete Message   Reply w/Quote
A friend and I just rebuilt a 5.0 engine in his 86 hatchback.
We got a gt instrument from ehay with a 140 speedo and 7g tach.
His original computer is for a tbi car but we went with a 600 edelbrock carb.
His tach seems to be registering way to high(like 5000 rpm's at 55 mph)
His old cluster had an adjustment hole with 4,6 and 8 listed around it with a set screw in the center.
His new cluster has the hole but no adjuster in it.
Is there any other way of calibrating it to get it closer to normal?
Thanks for all of your help.

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Moneymaker
Administrator

Posts: 21844
From: Lyons, IL, USA
Registered: May 99

posted 01-07-2004 07:03 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
You have to take it to a radio repair/speedo station. They have to change the calibration for you. Call your local F/L/M dealer for the name of the shop they use.

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