Pontiac Tempest Speedometer Cable: A Guide for 1961-1970 Models
Everything you need to know before replacing the speedometer cable on your classic Tempest.
- A bouncing needle or squeaking from the dash are the classic signs of a failing speedometer cable.
- Aftermarket cables are the only realistic option; lubricate the inner cable with grease before installing for longer life.
- Measure your old cable's length before ordering; lengths vary by year and transmission.
- Avoid sharp bends when routing the new cable to prevent premature failure.
Signs of a Failing Speedometer Cable
When a speedometer cable starts to fail, it usually gives you a few clear warnings. Because it's a mechanical part, the symptoms are often audible and visible.
- Bouncing Speedometer Needle: The most common symptom is a speedometer needle that jumps or wavers, especially at lower speeds. This happens when the inner cable binds and releases inside the housing.
- Squealing or Clicking Noises: You might hear a squeaking, grinding, or clicking sound coming from behind the dashboard. This is the sound of the dry cable struggling to turn inside its casing.
- Inaccurate Speed Reading: The speedometer might read a speed that is obviously too low, or it may get stuck at a certain speed.
- No Speed Reading: The final stage of failure is a speedometer that doesn't move at all. This usually means the inner cable has snapped.
Don't Ignore the Noise
If you hear noises from your speedometer, it's best to disconnect the cable from the back of the gauge as soon as possible. Continuing to run a binding cable can put stress on the internal gears of the speedometer head itself, potentially causing more expensive damage.
Choosing the Right Aftermarket Cable
For a vehicle from the 1960s, finding a New Old Stock (NOS) OEM cable is nearly impossible. The aftermarket is your primary source. Quality and price can vary significantly between brands.
Brand Tiers for Your Tempest
Premium / Custom Fit:
- Lokar: Lokar is a top-tier brand known for high-quality, durable components, often used in custom and high-performance builds. Their cables typically feature braided stainless steel housings and quality aluminum fittings. They are often sold as "cut-to-fit" kits, which provides a custom length for a perfect installation but requires more work. Expect to pay a premium for this quality.
Standard Replacement:
- ATP & Pioneer Cable: These brands offer direct-fit, budget-friendly replacement cables that get the job done. While functional, some owners in forums have noted that the quality may not match the original GM part. These cables are a cost-effective solution for a daily driver or standard restoration.
Pro Tip: Regardless of the brand you choose, it is highly recommended to pull the inner cable out of the new housing and apply a light coat of white lithium grease or specific cable lubricant before installation. Many aftermarket cables come with minimal lubrication from the factory.
Specialty Application:
- B&M: The B&M cable you may find listed is typically a service part for their specific GM Converter Lock-Up Control Kit. It is not a standard, universal replacement speedometer cable for a factory setup.
Common Ordering Mistakes
The biggest mistake is ordering the wrong length. GM used various cable lengths throughout the years, depending on the transmission, chassis, and options like cruise control. Some cars with cruise control even used a two-piece cable system. Always measure your original cable housing from tip to tip before ordering a replacement. Common lengths for these cars range from 61 to 83 inches.
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket (Standard) | $15 - $30 |
| New Aftermarket (Premium/Custom) | $100 - $152 |
| Shop Labor | $75 - $150 |
Frequently Asked Questions
Is it difficult to replace a Tempest speedometer cable?
No, it's a relatively easy job for a DIY mechanic. It requires basic tools and the ability to work under the dashboard and under the car. The main steps are unscrewing the cable from the transmission and unclipping it from the back of the speedometer gauge.
Do I need to drain any fluid to change the cable?
No. The speedometer cable screws onto the outside of the transmission housing. No transmission fluid will leak out when you remove it.
My new cable is a few inches longer than the old one. Can I still use it?
Yes, a slightly longer cable is usually fine. The most important thing is to route it carefully, avoiding any sharp bends or kinks that could cause it to bind. A smooth, sweeping curve from the transmission to the firewall and into the dash is ideal.
Could the problem be the speedometer itself and not the cable?
Yes, it's possible. The internal mechanism of the speedometer head can become dry and bind, causing symptoms similar to a bad cable. A good diagnostic test is to disconnect the cable from the back of the gauge and spin the inner cable with your fingers or a drill. If the cable spins freely, the problem is likely in the speedometer head.
Were there any recalls for the 1961-1970 Tempest speedometer cable?
No recalls or Technical Service Bulletins (TSBs) were found for the speedometer cable on the 1961-1970 Pontiac Tempest. The NHTSA database does not typically list safety recalls older than 15 years unless a manufacturer extends coverage.
Technical Specifications
Connection to the speedometer head is typically a push-on style with a spring clip. Connection to the transmission is a screw-on fitting. Cable length is the most critical specification and must be verified by the owner, with common lengths being 61", 63", 73", 78", and 83".
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.