73 350 Automatic Jumpy Tach
Le Mans Master
Joined: Jan 2001
Posts: 6,742
Likes: 1,384
Eric-
I believe a 75 is an electric tach not mechanical.
Verify that and it might just be your tach filter. You can make one cheap(if you can solder & use heat shrink) or pay too much for a prebuilt unit.
I believe a 75 is an electric tach not mechanical.
Verify that and it might just be your tach filter. You can make one cheap(if you can solder & use heat shrink) or pay too much for a prebuilt unit.
Last edited by carriljc; Jul 28, 2021 at 01:56 PM.
Racer
Joined: Jan 2017
Posts: 496
Likes: 153
From: San Francisco Bay Area
Had similar jumpy tach. In my case the cable routing required a change to eliminate hard bends. Additionally I lubricated with some graphite. Also might check to see if it is screwed tight at the distributor. Good luck
Thread Starter
Instructor
Joined: Jun 2021
Posts: 213
Likes: 45
From: Georgia
