TST 507 Tire Pressure Monitoring System — 6 Cap-Sensor Kit (TST-507-RV-6-C)

Published · Researched 2026-09-21

2026 lineup note: As of September 2026 the TST 507 remains the RV community's reference TPMS — this dossier covers the 6 cap-sensor color-display kit (TST-507-RV-6-C): 3.5" color monitor, 6 cap sensors, repeater, suction-cup dash pad + 12V adapter. Listing warning: at least one retailer listing uses a flow-through (FT) SKU while describing cap sensors — buy by the exact TST-507-RV-6-C part number. Warranty conflict: TST's 3-year warranty is best-supported; one mismatched retailer listing says 2 years — carry as UNVERIFIED, not truth.

Version lineage (2023–2026)

• TST 507 (pre-2023–current): The long-running RV TPMS — cap-sensor and flow-through-sensor options, monochrome then color displays.
• Color display generation: 3.5" color monitor is the current head unit.
• TST-507-RV-6-C (this dossier): 6 cap sensors, color display, repeater included.
• 2023–2026: No generational revision documented; the 507 remains the community standard against which newcomers (TireMinder, EEZ RV) are judged.

Overview

The TST 507 is the tire-pressure monitoring system that RV forums recommend the way they recommend surge protectors — as cheap insurance against the catastrophic failure mode (a blowout on a dual-axle trailer at highway speed). Six cap sensors screw onto the valve stems and report pressure and temperature to the 3.5" color dash monitor; the included repeater ensures the signal reaches from the trailer's rear tires to the tow vehicle. It monitors up to 38 tires and 4 towables, with high/low pressure, fast-leak, and high-temperature alerts. Sensor batteries are user-replaceable CR2032s.

Key Specs

(Specs: tsttruck.com aftermarket-kits page; Tweety's listing — https://tweetys.com/tst507-color-syste-6sensor-car-w-suction-cup-dash-pad-and-12-volt-adapter.aspx — captured in 2026-09-20 research.)

Pricing

• Manufacturer price: $559.17 (tsttruck.com).
• Street: $453.00 observed (Tweety's).
• All prices USD, research date 2026-09-20.

In the Box

• 3.5" color monitor
• 6 cap sensors
• Repeater
• Suction-cup dash pad + 12V adapter
• (UNVERIFIED: sensor batteries pre-installed — confirm.)

Warranty

• UNVERIFIED conflict: 3-year per TST/best-supported sources vs. 2-year in one mismatched retailer listing (which also misuses an FT SKU). Treat 3-year as likely; confirm at purchase.

Support & Parts

• Truck System Technologies (TST) — US-based, RV-community-present support with a reputation for answering fitment questions. Replacement/extra sensors, repeaters, and CR2032 batteries widely available.

Community Verdict

The 507 is the TPMS that ends the "which TPMS" threads — owners describe the purchase as the moment they stopped worrying about the tires they can't see. The cap sensors are the right choice for most RVs (lighter than flow-through, no valve-stem stress — though metal valve stems are still recommended for the sensor weight). The repeater-included kit matters: long trailers and fifth wheels genuinely need it, and kits without one generate the "my rear sensors drop out" complaints. The fast-leak alert is the feature owners credit with saving a tire — a slow leak you catch at a rest stop is a $200 tire; a blowout is a $2,000 fender.

Additional voices (Sept 2026 research): the TPMS threads have one consistent pre-purchase argument — cap vs. flow-through sensors. Flow-through lets you add air without removing the sensor; cap is lighter, cheaper, and less leak-prone. The community consensus for RVs: cap sensors + metal valve stems, and the 6-sensor kit is the right size for a single-axle-pair trailer + tow vehicle (or a motorhome). The anti-theft locking nuts divide opinion — most owners skip them.

Long-term durability & warranty-claim reality

The sensors live in the harshest environment on the RV — heat, water, road salt, centrifugal force. CR2032s last ~1 year (carry spares); the sensors themselves last years but are consumables on a long enough timeline — budget a sensor replacement every 3–5 years. The monitor is a dash electronic — keep it out of direct summer sun when parked. The 3-year warranty is the thing to confirm in writing; it's the best in the category if it holds.

Version history — year by year

• 2023: Current; color display generation established.
• 2024: No revision documented.
• 2025: No revision documented.
• 2026: Still current; $453–559 street.

Head-to-head vs closest rivals

• No direct catalog rival — this is the catalog's only TPMS. The comparison set:
• vs TireMinder / EEZ RV TPMS (outside catalog): the perennial forum debate — all three have loyalists; the 507 wins on community tenure and the included repeater.
• vs flow-through sensor kits (TST's own FT line): add air without removing sensors vs. lighter/cheaper/more reliable — cap wins for most RV use.
• vs no TPMS: the actual alternative most owners are upgrading from — a $453 kit vs. a blowout's $2,000+ body damage. The math isn't close.

Care & maintenance

Metal valve stems (required — rubber stems flex under sensor weight); replace CR2032s annually (proactive, not reactive); remove sensors for winter storage in freezing climates; keep a spare sensor and batteries in the rig; re-pair after battery changes per the manual.

Buying traps

• The FT-SKU mislabel: at least one listing uses a flow-through SKU while describing cap sensors — verify TST-507-RV-6-C and that the photo shows cap sensors.
• Rubber valve stems: sensors on rubber stems is the #1 installation mistake — have metal stems installed first.
• Repeater placement: the rear-sensor dropout complaints are almost always missing/misplaced repeaters — install it.
• The warranty conflict: 3-year vs. 2-year — confirm before purchase.
• Sensor count: 6 covers a tandem-axle trailer + tow vehicle — count your valve stems before ordering; duallys and spares need more.

Images

• tst-507-6-cap-tpms-1.jpg — hero kit shot (monitor + sensors)
• tst-507-6-cap-tpms-2.jpg — cap sensor detail
• tst-507-6-cap-tpms-3.jpg — monitor in-dash context shot
• tst-507-6-cap-tpms-4.jpg
• tst-507-6-cap-tpms-5.jpg
• tst-507-6-cap-tpms-6.jpg

See [research workspace] for dimensions, sources, and what each depicts.

Images

Research image inventory (filenames as archived; the gallery above shows the selected images):

1. tst-507-6-cap-tpms-1.jpg — provenance UNVERIFIED: gathered during catalog expansion; visually checked as exact model at gather time. Source page not recorded.
2. tst-507-6-cap-tpms-2.jpg — provenance UNVERIFIED: gathered during catalog expansion; visually checked as exact model at gather time. Source page not recorded.
3. tst-507-6-cap-tpms-3.jpg — provenance UNVERIFIED: gathered during catalog expansion; visually checked as exact model at gather time. Source page not recorded.
4. tst-507-6-cap-tpms-4.jpg — provenance UNVERIFIED: gathered during catalog expansion; visually checked as exact model at gather time. Source page not recorded.
5. tst-507-6-cap-tpms-5.jpg — provenance UNVERIFIED: gathered during catalog expansion; visually checked as exact model at gather time. Source page not recorded.
6. tst-507-6-cap-tpms-6.jpg — provenance UNVERIFIED: gathered during catalog expansion; visually checked as exact model at gather time. Source page not recorded.

Research date: 2026-09-20. Prices and availability change frequently — re-verify live before purchase. Figures marked UNVERIFIED could not be confirmed from a primary source during this research.

Sources

• tweetys.com — retrieval date not recorded