Jumpy tach

I have a jumpy tach on a 1991 Ford F-250 Lariat. Easy fix ?

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Lew Bodman opined in

jumpy how... do you mean it jumps to about 2.5 to 3 grand and just moves slightly while there?
Otherwise works normal?
Yep... get a book that shows how to pull the cluster, find one in wrecking yard
car-part.com
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.