Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG. This site is not affiliated with Porsche in any way.
Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners.
 

Welcome Guest ( Log In | Register )

 
 Reply to this topicStart new topic
> Tachometer Replacement, Any aftermarket tachs out there?
SteveNMaine
post Aug 19 2025, 12:55 PM
Post #1


Member
**

Group: Members
Posts: 76
Joined: 12-August 24
From: Maine
Member No.: 28,288
Region Association: None
My original tach did not work so I swapped it out with the parts car tach, it worked for a few days and it died. Did my 123Ignition kill my tach?

Are there any aftermarket 4.5in / 144mm replacements out there that don't cost $500?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
T.Rick6
post Aug 19 2025, 03:23 PM
Post #2


Member
**

Group: Members
Posts: 61
Joined: 1-October 19
From: Douglasville, Ga
Member No.: 23,512
Region Association: South East States
I’d get in touch with John Bell and have your original looked at, he’s reasonable and does a fantastic job. (IMG:style_emoticons/default/beerchug.gif)

Todd
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
GregAmy
post Aug 19 2025, 05:22 PM
Post #3


Advanced Member
****

Group: Members
Posts: 2,549
Joined: 22-February 13
From: Middletown CT
Member No.: 15,565
Region Association: North East States
https://speedhut.com/gauge-applications/rev...pm-shift-light/

3D printed a thin 1/4" wider plastic washer to put between the tach and the stock rubber grommet to capture it to the correct size so it would not fall in.

Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
76-914
post Aug 19 2025, 07:29 PM
Post #4


Repeat Offender & Resident Subaru Antagonist
**********

Group: Members
Posts: 13,785
Joined: 23-January 09
From: Temecula, CA
Member No.: 9,964
Region Association: Southern California
QUOTE(GregAmy @ Aug 19 2025, 04:22 PM) *

https://speedhut.com/gauge-applications/rev...pm-shift-light/

3D printed a thin 1/4" wider plastic washer to put between the tach and the stock rubber grommet to capture it to the correct size so it would not fall in.

Attached Image

I'll 2nd that! Good people and they'll work with you.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
digit3
post Aug 22 2025, 07:31 AM
Post #5


Newbie
*

Group: Members
Posts: 36
Joined: 23-November 19
From: Tucson
Member No.: 23,665
Region Association: Southwest Region
QUOTE(T.Rick6 @ Aug 19 2025, 04:23 PM) *

I’d get in touch with John Bell and have your original looked at, he’s reasonable and does a fantastic job. (IMG:style_emoticons/default/beerchug.gif)

Todd


+1

John does nice work and is pleasant to do business with.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
SteveNMaine
post Aug 22 2025, 08:03 AM
Post #6


Member
**

Group: Members
Posts: 76
Joined: 12-August 24
From: Maine
Member No.: 28,288
Region Association: None
How do I reach John Bell?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
rick 918-S
post Aug 23 2025, 11:23 AM
Post #7


Hey nice rack! -Celette
***************

Group: Members
Posts: 21,071
Joined: 30-December 02
From: Now in Superior WI
Member No.: 43
Region Association: Northstar Region
Speedhut!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
T.Rick6
post Aug 23 2025, 12:55 PM
Post #8


Member
**

Group: Members
Posts: 61
Joined: 1-October 19
From: Douglasville, Ga
Member No.: 23,512
Region Association: South East States
Jbellshome@yahoo.com
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
porschetub
post Aug 23 2025, 05:26 PM
Post #9


Advanced Member
****

Group: Members
Posts: 4,918
Joined: 25-July 15
From: New Zealand
Member No.: 18,995
Region Association: None
If you are good @ DIY and can open the gauge up you can fit an upgraded (modern ) replacement driver board for these tachs from Ashlocktech , not expensive and I had one fitted to my 73 911 tach and they work fantastic ,even when this tach worked previously it was never as good as with upgrade driver board.
Payed a specialist guy locally in my country to fit the board and test operation..best 75nzd I ever spent .
Used ones aren't a reliable option IMO as I found out (IMG:style_emoticons/default/sad.gif) .
Cheers.

Attached Image
User is online!Profile CardPM
Go to the top of the page
+Quote Post
Dave_Darling
post Aug 23 2025, 05:40 PM
Post #10


914 Idiot
***************

Group: Members
Posts: 15,240
Joined: 9-January 03
From: Silicon Valley / Kailua-Kona
Member No.: 121
Region Association: Northern California
A popular option used to be one of the tachs from "Monster Tach". You will want to measure the hole in the panel and the hole in the grommet to be sure, but one of them allegedly fit without mods.

Sorry, I don't remember which one. I never really liked the look so the model didn't stick in my head.

--DD
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
MAD914
post Aug 25 2025, 01:03 PM
Post #11


Newbie
*

Group: Members
Posts: 25
Joined: 3-August 11
From: La Verne, CA
Member No.: 13,390
Region Association: Southern California
QUOTE(SteveNMaine @ Aug 19 2025, 11:55 AM) *

My original tach did not work so I swapped it out with the parts car tach, it worked for a few days and it died. Did my 123Ignition kill my tach?

Are there any aftermarket 4.5in / 144mm replacements out there that don't cost $500?


The "Datsun Z" tachs at Speed Hut are 4.5 inches - I'm looking into them too.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
MAD914
post Aug 26 2025, 05:32 PM
Post #12


Newbie
*

Group: Members
Posts: 25
Joined: 3-August 11
From: La Verne, CA
Member No.: 13,390
Region Association: Southern California
QUOTE(SteveNMaine @ Aug 19 2025, 11:55 AM) *

My original tach did not work so I swapped it out with the parts car tach, it worked for a few days and it died. Did my 123Ignition kill my tach?

Are there any aftermarket 4.5in / 144mm replacements out there that don't cost $500?



@SteveNMaine

UPDATE: I called Speedhut. The woman I spoke to did not know who John Bell was. However, she directed me to the "Gauge Application" tab of their website, where they have a 4.5" "drop-in" Porsche tach replacement for $226. For another $30, they'll add turn signal and high-beam indicators to the gauge face. You'll need the adapter rings too, I think.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
robkammer
post Aug 28 2025, 02:00 PM
Post #13


Member
**

Group: Members
Posts: 233
Joined: 7-January 21
From: Vermilion Ohio
Member No.: 25,049
Region Association: North East States
Sort of on the subject, my tach was acting up t a vintage event last Fall and then quit. Turns out the connector at the coil was failing and then failed completely. Easy fix but ever since the tach has been wonky at low rpm's and idle. Is that wire the only signal source for the tach? And could the weak signal from the coil as the connector was failing caused some damage? All connections on the tach are solid.
Robbo
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
robkammer
post Aug 28 2025, 02:00 PM
Post #14


Member
**

Group: Members
Posts: 233
Joined: 7-January 21
From: Vermilion Ohio
Member No.: 25,049
Region Association: North East States
Sort of on the subject, my tach was acting up t a vintage event last Fall and then quit. Turns out the connector at the coil was failing and then failed completely. Easy fix but ever since the tach has been wonky at low rpm's and idle. Is that wire the only signal source for the tach? And could the weak signal from the coil as the connector was failing caused some damage? All connections on the tach are solid.
Robbo
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Dave_Darling
post Aug 29 2025, 01:06 AM
Post #15


914 Idiot
***************

Group: Members
Posts: 15,240
Joined: 9-January 03
From: Silicon Valley / Kailua-Kona
Member No.: 121
Region Association: Northern California
The black/purple wire is the only source of RPM information for the tach.

It is unlikely that a bad connection would kill the internals of the stock tach, but with old electronics, who knows?

--DD
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
VaccaRabite
post Aug 29 2025, 06:28 AM
Post #16


En Garde!
**********

Group: Admin
Posts: 13,779
Joined: 15-December 03
From: Dallastown, PA
Member No.: 1,435
Region Association: MidAtlantic Region
QUOTE(Dave_Darling @ Aug 29 2025, 03:06 AM) *

The black/purple wire is the only source of RPM information for the tach.

It is unlikely that a bad connection would kill the internals of the stock tach, but with old electronics, who knows?

--DD


Also, if the purple and black tach wire grounds out, not only will it kill the tach, but it will also kill the engine.

If the engine runs after the tach fails, its probably not a bad wire.

Zach
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

Reply to this topicStart new topic
2 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
1 Members: madd_dogg_914

 

Display Mode: Standard · Switch to: Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 29th August 2025 - 04:56 PM
Invision Power Board v9.1.4 © 2025  IPS, Inc.
All rights reserved 914World.com © since 2002
914World.com is the fastest growing online 914 community!
We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ...