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Product Summary

Universal Fit, .62" Overall Diameter

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    Key Specs

    MFG. Part #SN20
    BrandClassic Instruments
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    Classic Instruments SN20 Details

    Tach Filter The tach filter prevents erratic gauge operation by filtering out electrical interference from hi-power ignition systems, stereos, ect.


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    Classic Instruments SN20 Specifications

    KEY SPECS
    MFG. Part #SN20
    BrandClassic Instruments
    GENERAL
    Overall Diameter.62"
    Sold in QuantityEach
    NotesWire length is 9.00"

    Ratings & Reviews

    4.7

    16 Reviews

    Overall Assessment

    Customers widely praise the product for effectively eliminating erratic movement on tachometers and speedometers, enhancing accuracy. Users underline its easiness of installation, practicality, and usefulness. The product's excellent quality material contributes to its overall robustness and resilience. Multiple customers specifically state it as being the optimal solution when compared to other brands, emphasizing its superiority in stabilizing meter readings. Despite one case where it was ineffective on a specific model, the majority confirm the product as an ideal, reliable fix for bouncing gauges.

    4.7

    16 reviews

    5

    14

    4

    1

    3

    0

    2

    0

    1

    1

    Most Liked Positive Review

    4.0

    Stop the jitters

    I installed at the most obvious location, in my case, directly into the HEI distributor tach terminal and then was concerned about the elements and engine heat. Probably should have tied into the tach feed under the dash for more protection.

    Most Liked Negative Review

    1.0

    Does not work.

    Does not solve eratic needle bounce on 68 chev tic-toc-tach (after switch from points to elect distributor.)

    Filter by Ratings

    Very compact

    5.0

    a month ago

    FLD

    Grand junction co

    Verified

    Small enough to install anywhere, easy to connect

    Would Recommend

    If you have an erratic tachometer or speedometer this is it!

    5.0

    2 years ago

    L

    Pa

    Verified

    It stopped my tach jumping around. I thought it helped my speedometer but just the tachometer. If you have a digital dash and the speedometer bounces around then it is most likely your coil! Took out my new hi performance coil and replaced it with the stock and all is good now!

    Would Recommend

    This filter stopped the jumping needle on my tachometer.

    5.0

    4 years ago

    BIG-O-EXPRESS

    Willoughby ohio

    Verified

    My needle on my tachometer was jumping around. I installed this filter and it solved the problem. Great product

    Would Recommend

    I would buy this product again

    5.0

    5 years ago

    Drew

    Vincent, OH

    Verified

    I bought this device to keep my gauges from bouncing around. It made it so I could get an actual reading from the gauge.

    Would Recommend

    Tach filter

    5.0

    6 years ago

    mick

    Springfield ,Ill

    Verified

    Easy to install, works great .Satisfied with my purchase

    Would Recommend

    Yes

    5.0

    6 years ago

    Ford

    Edmond

    Verified

    Great price.

    Would Recommend

    Worked great on vdo tach

    5.0

    7 years ago

    Minty Fresh

    Ontario Ca

    Verified

    This noise filter took all the bounce out of my tach . Installed behind the dash , tach gives solid reading at needle now

    Would Recommend

    Ignition upgrade must

    5.0

    7 years ago

    C10 u Later

    Texas

    Verified

    Great quality part with clear directions. Nice heavy gauge wires with plenty of excess.

    Would Recommend

    Works Like A Charm !!

    5.0

    8 years ago

    WIJr

    Baytown, TX

    Verified

    My Classic Instruments 4 5/8" tach was very erratic and read about 700-800 RPM high. I ordered the SN20 filter based on their tech support suggestion. I got the filter installed this evening in my 64 El Camino.and the problem is solved. Very stable readings now.

    Would Recommend

    Best filter

    5.0

    8 years ago

    GW

    Sebastian Fl

    Verified

    Tried all ways to stop eradic tach needle. This one works great. Used it on VDO.

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