1958 Studebaker 3E5 Engine Oil Pressure Switch and Sending Unit Guide
Is your oil pressure light or gauge giving you trouble? Here's what owners of the 1958 Studebaker 3E5 need to know about this simple but critical sensor.
- A faulty oil pressure switch is a common cause for an incorrect gauge reading or a constantly lit warning light; always check your oil level first.
- For a 1958 Studebaker, a new aftermarket switch from a brand like Standard Ignition is the only practical and reliable replacement option.
- Replacement is a simple, DIY-friendly task that usually takes less than 30 minutes with basic hand tools.
- No recalls or TSBs are on record for this part, which is normal for a vehicle of this vintage.
Is Your Oil Pressure Light Lying to You?
On a classic truck like the 1958 Studebaker 3E5, the oil pressure warning system is your main window into the engine's health. But what happens when the sensor sending the signal goes bad? A faulty engine oil pressure switch can give you a false sense of security or a needless scare. It might fail to warn you of dangerously low oil pressure, or it might keep the warning light on even when the pressure is perfectly fine. Since this part is simple and inexpensive, it's often the first thing to check when you have oil pressure warning issues.
First, Check Your Oil
Before assuming the switch is bad, always check your engine's oil level and condition. A flickering light or low reading could be a true warning. If the oil level is low, or if you hear any engine ticking, knocking, or clunking noises, address those issues first to prevent catastrophic engine damage.
Symptoms of a Failing Oil Pressure Switch
A bad oil pressure switch can cause confusing symptoms. Here’s what to look for:
- Oil Light Stays On: The most common symptom is an oil pressure warning light that is always on, even after you've confirmed the oil level is correct.
- Flickering Oil Light: A light that flickers, especially at idle or during turns, can point to a failing switch that is right on the edge of its pressure threshold.
- Incorrect Gauge Reading: If your truck has a pressure gauge, a bad sending unit can cause the needle to read zero, max out, or jump around erratically.
- Oil Leak: The switch or sending unit itself is threaded into an oil passage and can develop a leak over time, visible as oil seepage from the sensor's body or connector.
Choosing the Right Aftermarket Part
For a 1958 Studebaker, finding a "New Old Stock" (NOS) original part is nearly impossible and often not practical. The good news is that modern aftermarket replacements are reliable and readily available.
- OEM vs. Aftermarket: New OEM parts are no longer manufactured. While you might find a NOS part on auction sites, a new aftermarket part from a reputable brand is the most practical and reliable choice.
- Brand Focus - Standard Ignition: Standard Ignition (also known as Standard Motor Products) is a well-established aftermarket brand that has produced electrical components for decades. For a simple part like an oil pressure switch on a vintage vehicle, their quality is widely considered reliable and is a common choice for restorations and repairs. The Standard PS64 is a frequently cited part number for this type of application.
Pro Tip: Use Thread Sealant
The oil pressure switch has tapered pipe threads. When installing the new switch, apply a small amount of thread sealant or Teflon tape to the threads to prevent oil leaks. Be careful not to use too much, as you don't want it to break off and enter the engine's oil passages.
Known Issues, Recalls, or TSBs
Searches of the National Highway Traffic Safety Administration (NHTSA) database and other sources show no recalls or technical service bulletins (TSBs) for the engine oil pressure switch on a 1958 Studebaker 3E5. This is typical for vehicles of this era, as digital records were not kept.
| Part Type | Price Range | Notes |
|---|---|---|
| New Aftermarket (Standard Ignition) | $12.56 | The most common and recommended option. |
| New Old Stock (OEM) | $20 - $50+ | Very rare, prices vary wildly. May not be reliable due to age. |
| Shop Labor | $50 - $100 | Typically a quick job, taking less than an hour. |
Frequently Asked Questions
Where is the oil pressure switch on my 1958 Studebaker 3E5?
On most classic Studebaker engines (both V8 and 6-cylinder), the oil pressure switch is threaded directly into the engine block. It is typically located near the oil filter or the distributor. Look for a small sensor with one or two wires attached.
Is this a difficult part to replace myself?
No, this is a very DIY-friendly job with a difficulty of 1 out of 5. Access is generally good on these older trucks. The process involves disconnecting the wire, using a wrench or a special deep socket to unscrew the old switch, applying sealant to the new one, and installing it.
What's the difference between a 'switch' and a 'sending unit'?
These terms are often used interchangeably. A 'switch' typically operates a simple on/off warning light. A 'sending unit' or 'sender' operates a variable gauge that shows a range of pressures. Ensure you are buying the correct part for your truck's dashboard configuration.
My new switch gives a different reading than my old one. Is it bad?
Not necessarily. Aftermarket sending units can be calibrated slightly differently than the original factory parts. As long as the gauge shows reasonable pressure when running and drops to zero when off, it is likely working correctly.
Frequently Asked Questions
Where is the oil pressure switch on my 1958 Studebaker 3E5?
On most classic Studebaker engines (both V8 and 6-cylinder), the oil pressure switch is threaded directly into the engine block. It is typically located near the oil filter or the distributor. Look for a small sensor with one or two wires attached.
Is this a difficult part to replace myself?
No, this is a very DIY-friendly job with a difficulty of 1 out of 5. Access is generally good on these older trucks. The process involves disconnecting the wire, using a wrench or a special deep socket to unscrew the old switch, applying sealant to the new one, and installing it.
What's the difference between a 'switch' and a 'sending unit'?
These terms are often used interchangeably. A 'switch' typically operates a simple on/off warning light. A 'sending unit' or 'sender' operates a variable gauge that shows a range of pressures. Ensure you are buying the correct part for your truck's dashboard configuration.
My new switch gives a different reading than my old one. Is it bad?
Not necessarily. Aftermarket sending units can be calibrated slightly differently than the original factory parts. As long as the gauge shows reasonable pressure when running and drops to zero when off, it is likely working correctly.
Technical Specifications
OEM Part Numbers: 1539898
Typically features a single terminal for a warning light or gauge, with tapered pipe threads for screwing into the engine block.
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.