1968 GTO after market tach problems - Pontiac GTO Forum
User Tag List

 
LinkBack Thread Tools Display Modes
post #1 of 6 (permalink) Old 02-02-2019, 05:28 PM Thread Starter
 
Join Date: Jan 2019
Posts: 8
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
1968 GTO after market tach problems

put in a tach were the clock was. hooked the 12 volt then one to the coil with fuse the tack goes up when you first start it and that's it do you think it's because pertronix . I was told it would work
green is offline  
Sponsored Links
Advertisement
 
post #2 of 6 (permalink) Old 02-02-2019, 07:51 PM
 
Join Date: Dec 2012
Location: Gastonia, NC - Born & raised in Connecticut - 31 years
Posts: 3,167
Mentioned: 0 Post(s)
Tagged: 1 Thread(s)
Quoted: 305 Post(s)
Garage
Quote:
Originally Posted by green View Post
put in a tach were the clock was. hooked the 12 volt then one to the coil with fuse the tack goes up when you first start it and that's it do you think it's because pertronix . I was told it would work
Assume this is not a factory style aftermarket tach, but an add-on type.

You should have more than 2 wires. You should have a red 12V power wire. Black ground wire, White 12V wire for tach light, and Green wire to (-)Negative side of the coil.

No, Pertronix install should not create a problem, but there have been some tachs that may be affected by the conversion. I had Pertronix with a standard add-on type tach and had no issues.
PontiacJim is offline  
post #3 of 6 (permalink) Old 02-03-2019, 08:45 AM Thread Starter
 
Join Date: Jan 2019
Posts: 8
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
This is a factory replacement tach two bulbs 12 volt wire and one to the coil
green is offline  
 
post #4 of 6 (permalink) Old 02-03-2019, 09:08 PM
 
Join Date: Dec 2012
Location: Gastonia, NC - Born & raised in Connecticut - 31 years
Posts: 3,167
Mentioned: 0 Post(s)
Tagged: 1 Thread(s)
Quoted: 305 Post(s)
Garage
Quote:
Originally Posted by green View Post
This is a factory replacement tach two bulbs 12 volt wire and one to the coil
OK. My next thought would be, how is it grounded? It may be a ground issue. It may be grounded through the circuit board or it may use a separate grounding strap/wire.

It could also be defective, but I would check all avenues first before looking for a refund or replacement.
PontiacJim is offline  
post #5 of 6 (permalink) Old 02-04-2019, 07:47 PM Thread Starter
 
Join Date: Jan 2019
Posts: 8
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
the circuit board has a ground and I tried a extra one it Must be bad . thanks for your advise jim
green is offline  
post #6 of 6 (permalink) Old 02-17-2019, 03:24 PM
 
Join Date: Apr 2011
Location: Glen Ellyn,Il
Posts: 13
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I also have a 68 GTO with Pertronix and did the exact same thing. I had a NOS tach never used still in the GM packaging. I also installed it where the clock was. When I run the car the needle moves up ever so slightly. Maybe 500 rpm or so and then it goes down. There’s supposed to be an adjustment hole in the back of the tach for a very small screw driver to adjust it. I never tried it cause it was so difficult for me just to install it. I put it on the list to have someone other than me with my sausage fingers look at. That was 3 years ago.
Bill E is offline  
Sponsored Links
Advertisement
 
Reply

  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO Paint Shop Discussions

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Pontiac GTO Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
After market tach wiring 1969 GTO LibertyBlue69GTOConv 1964-1974 Tempest, LeMans & GTO Technical and Electrical Wiring 3 08-25-2014 08:21 AM
Quality of after Market GTO bumpers ? 65gtomd 1964-1974 Tempest, Lemans & GTO Complete Exterior Body 12 04-30-2013 08:35 AM
1965 GTO after market sheet metal Scotty 1964-1974 Tempest, LeMans & GTO Projects, Barn Finds & Restoration Discussions 3 10-24-2010 08:08 PM
After market company for the Holden (GTO) hm3to1stlt 2004-2006 GTO General Discussion 1 11-16-2004 01:24 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome