The 1947 - Present Chevrolet & GMC Truck Message Board Network

Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board


Thread Tools Display Modes
Old Yesterday, 08:11 PM   #1
Active Member
Join Date: Jun 2015
Location: Portland, OR
Posts: 168
Tach Filter GM 14020025

I see this Tach Filter was offered on CK trucks from 75-81. I have a 76/77 gauge cluster with tach that I want to swap with my non-tach gauge cluster (into a 77 C10). Question is, must I use one of these tach filters? And if so, where is it mounted? Is it mounted to the intake manifold? I do not want to fry the tach, just had it refaced, cleaned and calibrated for a pretty penny.
K25alive is offline   Reply With Quote
Old Yesterday, 10:07 PM   #2
Senior Member
hatzie's Avatar
Join Date: Oct 2008
Location: Wentworth, NH
Posts: 3,872
Re: Tach Filter GM 14020025

I'm not sure that you need one.
The 1983 wiring diagrams show what's inside the filter. You can build one.
1959 M35A2 LDT465-1D SOLD
1967 Dodge W200 B383, NP420/NP201 SOLD
1969 Dodge Polara 500 B383, A833 SOLD
1972 Ford F250 FE390, NP435/NP205 SOLD
1976 Chevy K20, 6.5L, NV4500/NP208 SOLD
1986 M1008 CUCV SOLD
2000 GMC C2500, TD6.5L, NV4500
2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263
2009 Impala SS LS4 V8

RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...Please include at least the year and model in your threads. It'll be easier to answer your questions.
And please let us know if and how your repairs were successful.
hatzie is online now   Reply With Quote
Old Yesterday, 11:09 PM   #3
Factory Guy
Registered User
Factory Guy's Avatar
Join Date: Jun 2019
Location: Overland Park, Kansas
Posts: 106
Re: Tach Filter GM 14020025

I would ask your restorer of your gauges if it needs a tach filter, My guess is it doesn't, unless you get "tach noise" I wouldn't worry about installing a filter. I have installed a bunch of tachs over the years and I have never installed a filter on ANY.
Factory Guy is offline   Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not 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

Forum Jump

All times are GMT -4. The time now is 11:23 AM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
Copyright 1997-2013