• Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • Fox 5.0 Mustang Tech

RPM Gauge Jumping

  • Thread starter Thread starter garage91
  • Start date Start date Mar 19, 2004
G

garage91

New Member
Mar 19, 2004
5
0
0
GA
Mar 19, 2004
#1
  • Mar 19, 2004
  • #1
Hello All. I am happy to be here and look forward to learning as much as I can. My first problem is this: My RPM gauge likes to jump around whenever it wants. Sometimes it will work and show the correct rpm's, then it will jump to 4000 or so and sit there. Then it will drop back down and tell the correct rpm's again, and so on and so on. The engine is fine and does not fluctuate, just the needle. Where do I start first to fix this problem? And what do I need to do? Any help is greatly appreciated.
Sincerely,
James
 

85_SS_302_Coupe

it sucks (I know) to be on the receiving end
15 Year Member
Nov 11, 2003
6,945
1,598
223
Northern KY
Mar 20, 2004
#2
  • Mar 20, 2004
  • #2
Well there are a couple possible problems. One, your tach could just be going bad and you need a new one, the cable could be bad, or i had a problem just like this once and found out that my battery cable was loose. It had enough connection to start the car but vibrated around when i drove so it lost power to the tach...
 
You must log in or register to reply here.

Similar threads

Engine Defective PIP sensor ?
  • bock
  • Sep 5, 2025
  • Fox 5.0 Mustang Tech
  • 2
Replies
20
Views
1K
Fox 5.0 Mustang Tech Oct 11, 2025
Mindseye007
8
Foxbody high rpms and surging rpms
  • 86foxseth
  • Jun 9, 2026
  • Fox 5.0 Mustang Tech
Replies
4
Views
183
Fox 5.0 Mustang Tech Jun 13, 2026
Noobz347
Fox Fuel Pump Issues After Replacement/Upgrade
  • Ryu
  • Jun 23, 2026
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • 2
Replies
23
Views
532
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Jul 5, 2026
Ryu
J
Electrical Cluster bulb LED swap gauges bounce
  • jpfox
  • Jun 29, 2025
  • Fox 5.0 Mustang Tech
Replies
1
Views
188
Fox 5.0 Mustang Tech Jun 29, 2025
gkomo
T
It’s been a while lol
  • TripleLAutoandDiesel
  • Jan 24, 2026
  • The Welcome Wagon
Replies
0
Views
87
The Welcome Wagon Jan 24, 2026
TripleLAutoandDiesel
T
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • Fox 5.0 Mustang Tech
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?