2020 Silverado 5.3 would it fit?

It would if you have the harness for it if not you are better off getting a E85 kit for your truck instead.

Does this sensor also measure fuel temperature?

Yes - this sensor also measures temperature. The ACDelco (or Continental) flex fuel sensor outputs a PWM signal that is from 50hz to 150hz for % ethanol content and encodes the fuel temperature in the PWM duty cycle. You need some specific circuitry or an intelligent ECU to extract both % ethanol and fuel temp from the signal pin that is in the 3-pin connector.

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Description

⚡ Drive smarter with GM-certified precision fuel sensing!

LIGHTWEIGHT COMPACT - Sleek 4x4x1 inch form factor weighing just 1.58 oz, engineered for modern vehicles.
PRECISION ENGINE TUNING - Monitors ethanol content to optimize air/fuel mix and ignition timing for peak performance.
SEAMLESS OEM INTEGRATION - Designed to match original GM specs for effortless installation and perfect compatibility.
GM RECOMMENDED RELIABILITY - Factory-approved replacement ensuring OEM-level durability and fit.
HEAT RESISTANT ENGINEERING - Operates flawlessly up to 250°F, built for demanding engine environments.

The ACDelco 13577429 Flex Fuel Sensor is a GM-recommended OEM replacement part that accurately monitors ethanol levels in flex fuel vehicles. Engineered to GM specifications, it ensures optimal engine performance by enabling precise air/fuel mixture and ignition timing adjustments. Built to withstand temperatures up to 250°F, this compact and lightweight sensor guarantees reliable, durable operation and seamless fitment in your GM vehicle.

Specifications

Brand	ACDelco
Item dimensions L x W x H	4 x 4 x 1 inches
Item Weight	0.05 Kilograms
Style	Modern
Mounting Type	Flange Mount
Output Type	Analog
Specific Uses For Product	automotive, motorcycle
Upper Temperature Rating	2.5E+2 Degrees Fahrenheit
UPC	808709571094
Global Trade Identification Number	00808709571094
Manufacturer	AC Delco
Model	Flex Fuel Level Sensor
Item Weight	1.58 ounces
Product Dimensions	4 x 4 x 1 inches
Item model number	13507129
Is Discontinued By Manufacturer	Yes
Exterior	Machined
Manufacturer Part Number	13507129
OEM Part Number	13577429

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