This page lists one electrical switch & relay part for the 2021 Ram 4000: Oil Pressure Sender / Switch from DORMAN, matched to both the 5.7L V8 and the 6.4L V8.
On the 2021 Ram 4000, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches.
The 2021 Ram 4000 was sold with both the 5.7L V8 and the 6.4L V8. The single part on this page fits every engine.
The part number opens a page with every vehicle that part fits.
Oil Pressure Sender / Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: all 2021 4000 engines | 987010 | 🇲🇽 MX | View on Amazon |
This table covers the senders and switches that report oil pressure to the gauge or lamp. Typical signs include a lamp that stays on, or a gauge that never moves. Confirm power and ground at the connector before replacing the sender or switch.
One part is listed for the 2021 Ram 4000 — DORMAN 987010.
Buying Electrical Switch & Relay Parts for a 2021 Ram 4000
On this vehicle, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches.
- You do not need to pick an engine: every electrical switch & relay part on this page fits both the 5.7L V8 and the 6.4L V8.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, inspect the connector terminals behind any failed switch — heat damage there will kill the new part too.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Oil Pressure Sender / Switch .
Frequently Asked Questions
How many electrical switch & relay parts fit the 2021 Ram 4000?
This page lists one electrical switch & relay part for the 2021 Ram 4000: Oil Pressure Sender / Switch from DORMAN, covering both the 5.7L V8 and the 6.4L V8.
Do electrical switch & relay parts differ between 2021 Ram 4000 engines?
No. On this page every electrical switch & relay part fits both the 5.7L V8 and the 6.4L V8. You do not need to pick an engine to choose the right row — use the notes for position and trim.
What are the signs of electrical switch & relay problems on a 2021 Ram 4000?
Common symptoms include accessories that work intermittently, a click without action, or one function dead while its fuse tests fine. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, inspect the connector terminals behind any failed switch — heat damage there will kill the new part too.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2021 Ram 4000 was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 2021 Ram 4000?
Every part on this page already fits both the 5.7L V8 and the 6.4L V8. Then swap a suspect relay with an identical known-good one from the fuse box before buying — it is the fastest diagnostic there is. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2021 Ram 4000
Electrical Switch & Relay Parts for Other Ram 4000 Years
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