---
title: "304-5666: 3-Pin DT Atmospheric Pressure Sensor"
url: https://parts.cat.com/en/catcorp/product/304-5666
description: Shop Cat® parts online for atmospheric pressure sensor 304-5666. It measures air pressure to determine altitude for precise grading and leveling.
---

# 304-5666: 3-Pin DT Atmospheric Pressure Sensor

![304-5666: 3-Pin DT Atmospheric Pressure Sensor](https://caterpillar.scene7.com/is/image/Caterpillar/CM20181031-47997-56329?fmt=WebP&hei=960&iccembed=0&layer=COMP&op_sharpen=0&op_usm=1%2C1%2C6%2C0&printres=72&qlt=88%2C1&resmode=sharp2&wid=960)

Shop Cat® parts online for atmospheric pressure sensor 304-5666. It measures air pressure to determine altitude for precise grading and leveling.

Brand: Cat

## Frequently bought together

### 304-5666: 3-Pin DT Atmospheric Pressure Sensor
![304-5666](https://caterpillar.scene7.com/is/image/Caterpillar/CM20181031-47997-56329?fmt=WebP&hei=162&iccembed=0&layer=COMP&op_sharpen=0&op_usm=1%2C1%2C6%2C0&printres=72&qlt=88%2C1&resmode=sharp2&wid=162)

### [304-5667: Engine Pressure Sensor](https://parts.cat.com/en/catcorp/product/304-5667)
![304-5667](https://caterpillar.scene7.com/is/image/Caterpillar/CM20181031-47997-42219?fmt=WebP&hei=162&iccembed=0&layer=COMP&op_sharpen=0&op_usm=1%2C1%2C6%2C0&printres=72&qlt=88%2C1&resmode=sharp2&wid=162)

### [304-5668: Engine Oil Pressure Sensor](https://parts.cat.com/en/catcorp/product/304-5668)
![304-5668](https://caterpillar.scene7.com/is/image/Caterpillar/CM20170518-39543-49888?fmt=WebP&hei=162&iccembed=0&layer=COMP&op_sharpen=0&op_usm=1%2C1%2C6%2C0&printres=72&qlt=88%2C1&resmode=sharp2&wid=162)

### [214-7568: STOR O-Ring Seal (SAE 9/16-18)](https://parts.cat.com/en/catcorp/product/214-7568)
![214-7568](https://caterpillar.scene7.com/is/image/Caterpillar/CM20210629-0d87d-fdec4?fmt=WebP&hei=162&iccembed=0&layer=COMP&op_sharpen=0&op_usm=1%2C1%2C6%2C0&printres=72&qlt=88%2C1&resmode=sharp2&wid=162)

### [132-6469: Cylinder Head Valve Mechanism Wiring Harness](https://parts.cat.com/en/catcorp/product/132-6469)
![132-6469](https://caterpillar.scene7.com/is/image/Caterpillar/CM20201224-276a0-cd1c5?fmt=WebP&hei=162&iccembed=0&layer=COMP&op_sharpen=0&op_usm=1%2C1%2C6%2C0&printres=72&qlt=88%2C1&resmode=sharp2&wid=162)

### [3S-9643: Rotating Shaft Lip Type Seal](https://parts.cat.com/en/catcorp/product/3S-9643)
![3S-9643](https://caterpillar.scene7.com/is/image/Caterpillar/CM20210628-140ac-a6b05?fmt=WebP&hei=162&iccembed=0&layer=COMP&op_sharpen=0&op_usm=1%2C1%2C6%2C0&printres=72&qlt=88%2C1&resmode=sharp2&wid=162)

## Description for part number 304-5666

Description:  
Cat low pressure sensors use capacitance or strain gage based technology that generates an output signal (Analog or PWM) that is proportional to the applied pressure. The sensors are available with a variety of electrical connectors and process connection types.

Attributes:  
- Small form factor  
- Easy installation  
- Available with integral connector or various harness lengths  

Applications:  
- Low pressure sensors are primarily used on engine related applications such as air systems, exhaust after treatment systems, fuel systems, engine oil systems, etc.  
- Cat pressure sensors are application specific sensors. Consult your owner’s manual or contact your local Cat Dealer for more information.

**Warning:** This product can expose you to chemicals including Lead and lead compounds, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to [www.P65Warnings.ca.gov](https://www.P65Warnings.ca.gov).

## Specifications for part number 304-5666

- Hole Thread Size (in): SAE #6M
- Connector Type: 3 Pin DT
- Voltage (VAC): 5 DC Regulated

## Compatible Models for part number 304-5666

- **GENERATOR SET:** 3516C C18 3516B 3508B 3512B
- **MARINE AUXILIARY:** 3512C 3516C 3512B 3508B 3508C 3516B
- **MARINE ENGINE:** C18 3512C 3516 3508 3508C 3508B 3516B 3516C 3512B
- **ENGINE - INDUSTRIAL:** LD700E 3512B
- **ENGINE:** 3516E
- **INDUSTRIAL ENGINE:** 3512B 3516B 3516C
- **TRUCK:** 793D
- **PETROLEUM ENGINE:** 3508C 3516C 3516B 3508B 3512C 3512B
- **OFF HIGHWAY TRUCK:** 3508B
- **PETROLEUM GEN SET:** 3512B 3512C
- **WHEEL LOADER:** 994F

## Key

### Factory Fit
This part is designed to fit your Cat equipment based on the manufacturer’s specifications.

Any changes to the manufacturer’s configuration might result in the product not fitting your Cat equipment. Please consult your Cat Dealer before purchasing to ensure that this part is appropriate for your Cat equipment in its current condition and assumed configuration. This indicator cannot guarantee compatibility for all parts.

- Remanufactured
- Non-Returnable
- Kit
- Replaced