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#2752005
$37.19
/each
In Stock
$40.23
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Universal Fit, .62" Overall Diameter
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Return PolicyEliminate unwanted electrical interference and ensure accurate tachometer operation with the Classic Instruments SN20 Tach Filter Module. Designed to clean up RPM signals affected by ignition system noise, this compact module helps deliver stable and reliable tachometer readings in performance vehicles, hot rods, muscle cars, classics, and custom builds. Easy to install and highly effective, the SN20 improves gauge accuracy by filtering out signal disruptions that can cause erratic needle movement or inaccurate RPM displays. Compatible with most Classic Instruments tachometers, it's an essential component for enthusiasts demanding precise engine monitoring.
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CA WARNING:
Can expose you to lead, a carcinogen and reproductive toxicant. See www.P65Warnings.ca.gov
| KEY SPECS | |
|---|---|
| MFG. Part # | SN20 |
| Brand | Classic Instruments |
| GENERAL | |
| Overall Diameter | .62" |
| Sold in Quantity | Each |
| Notes | Wire length is 9.00" |
4.7
16 Reviews
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
8 months 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
3 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
5 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
7 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
8 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
9 years ago
GW
Sebastian Fl
Verified
Tried all ways to stop eradic tach needle. This one works great. Used it on VDO.
Showing 10 of 16 reviews
6 Questions • 6 Answers
Will this work with an ls1 engine using aftermarket tach gauge
by Ls swap monte carlo
• 3 years ago
1 answer
View Answer
will the sn20 tach filter work with 1967-1972 chevy pickups with aftermarket tach kits thank you ed blinzler
by ed
• 9 years ago
1 answer
View Answer
Will this filter work on a 6V system, positive ground system with a dual point Mallory distributor and a Flamethrower coil? If so, how should it be wired?
by Jim
• 10 years ago
1 answer
View Answer
Will this tach filter work on Chevy HEI distributor and what wires go where. Please include in answer the wiring to a 1980 Corvette OEM HEI distributor. Thank you, Sal C
by Sammy80
• 11 years ago
1 answer
View Answer
Will this work with a points ignition? I'm trying to replace the tach filter on my 73 Camaro that has the original points ignition.
by Lou1
• 12 years ago
1 answer
View Answer
I need to know which wire goes where?
by rattrod
• 15 years ago
1 answer
View Answer
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