Bosch Style Line 2in Electrical Water/Oil Temperature Gauge - Clear

Our review of the Bosch Style Line 2in electrical water/oil temperature gauge finds it best suited for hobbyists and mechanics who want a compact, easy-to-fit instrument with a classic look. The single biggest reason to buy is its simple, reliable design: a standard 2in black dial sized for a 2-1/16in opening with a bright pointer and internal 12 volt back lighting, so it reads clearly at night while matching common dash cutouts. Installation does require wiring and a negative ground 12 volt system, but Bosch includes the sending unit, adapters and mounting hardware to simplify the fit.

Key Features

• Standard size: The 2in dial fits a 2-1/16in opening, making it compatible with many aftermarket and replacement dash holes.
• Temperature range: The 100-280 degrees Fahrenheit span covers a wide variety of water and oil monitoring needs for street and light performance use.
• Complete mounting kit: Includes a removable black mounting panel, bezel and mounting hardware so the gauge can be installed cleanly without hunting for parts.
• Sending unit and adapters: Comes with a sending unit with 1/8in NPT thread plus 1/4in, 3/8in and 1/2in adapters to work with different fittings.
• Night visibility: Internal 12 volt back lighting provides a clear, illuminated pointer for low light driving conditions.
• Designed for 12V negative ground: Engineered specifically for common 12 volt negative ground electrical systems to avoid compatibility surprises.

Who It's For

The gauge suits drivers restoring classic cars, customizing dashboard clusters, and anyone needing a compact water or oil temperature monitor that fits a 2-1/16in hole. Its included sending unit and adapters make it convenient for installers working on a range of engines, and the black dial and bezel offer a conservative, OEM-like appearance.

Those who need extreme precision or professional motorsport-grade telemetry should look elsewhere, as a handful of users report temperature readings can trend hotter by about 10 degrees and some have mixed impressions of absolute accuracy. Also this is only for 12 volt negative ground systems and requires hookup wire, so vehicles with different electrical setups will need modifications.

Pros & Cons

Pros

• Good overall build and gauge quality with a clean, easy-to-read dial and bright pointer.
• Includes sending unit, multiple adapters, bezel and mounting hardware for straightforward installation.
• Back lighting makes the dial usable at night and matches typical 12V dashboards.
• Standard sizing fits common dash openings, simplifying replacement or upgrades.

Cons

• Some users report readings run roughly 10 degrees hot, so absolute accuracy can be mixed.
• Requires wiring and is only compatible with 12 volt negative ground systems, limiting use in other electrical setups.

Specifications

Product	Style Line 2in electrical temp gauge
Dial size	2in (fits 2-1/16in opening)
Range	100-280 degrees Fahrenheit
Power	12 volt internal back lighting; 12V negative ground systems only
Sending unit	Includes 1/8in NPT sender and 1/4in, 3/8in, 1/2in adapters
Bezel	Black bezel with removable black mounting panel
Hardware	Mounting hardware included (wiring not included)

Our Verdict

The Bosch Style Line 2in temperature gauge is a sensible, value-oriented choice for DIY installers and restorers who want a compact, attractive replacement gauge with a useful temperature range and included adapters. It offers solid build quality and night visibility; just be aware of the occasional user note that readings can run a bit hot and that the unit requires a 12 volt negative ground system and wiring work.

Frequently Asked Questions

Does it include a sending unit?
Yes. The gauge includes a sending unit with a 1/8in NPT thread plus 1/4in, 3/8in and 1/2in adapters.

Will it work on my 24V system?
No. The gauge is designed for 12 volt negative ground systems only and will not operate correctly on 24V systems without conversion.

Is the gauge easy to read at night?
Yes. It has internal 12 volt back lighting and a bright pointer for improved night legibility.