If the pump is shut off due to low pressure how can it be restarted?

Turn the power off for a moment then back on

I have a 2hp pump, can you recommend a relay?

Assuming that's a 220 volt pump 2 hp at 85% efficiency is about 8 amps. A 10 amp DPDT 8 pin relay is very common. They come with wiring diagrams usually.

Is this sutable for 12 gauge wire?

It’s been 3 months now since installation with no problems ! I Replaced a Merrill mechanical pressure switch which had the pump and power lines enclosed within it ! Along with one of the reviews that suggested plumbing reduction fittings, I had to add a Junction Box for the electrical wiring to house the 220 volt line and the line from the pump. I set the pressures for Low 55 # and Hi at 70 #. Will post in summer how it handles water pressure with the lawn irrigation.

What is the correct wiring of the unit? Since no mention of the color coding is available. A diagram w/colors would be helpful.

Only color that matters is the green/yellow wire is ground. Other 2 are your 2 hot lines (110, 115, 120V) each leg. They are labeled on the back for power in, and switched power out.

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GamaTech Pressure Switch for Water Pump and Air Pump, Digital Adjustable Pres...

Product ID: 505050347

Details

Brand
Generic
Color
Yellow Casing
Global Trade Identification Number
Horsepower
1.5 hp
Item Weight
9.6 ounces
Material
Brass Plastic

⚡220V AC power supply

💧0-230 PSI digital adjustable pressure range

🔧1/2 inch true NPT threaded connector

S$96

Duties & taxes included

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Description

💡 Upgrade your pump game with precision and protection!

ENERGY SMART SAFE - Stops pump operation during water shortages to avoid burnout—smart protection for your investment.
PLUG PLAY UPGRADE - Perfect drop-in replacement for outdated mechanical switches, modernizing your system instantly.
BUILT TO LAST PROTECT - IP66 waterproof rating and automatic pump shutoff prevent costly damage and downtime.
UNIVERSAL COMPATIBILITY - Seamlessly fits any 1.5HP or smaller water and air pumps with a true 1/2 inch NPT connector.
PRECISION DIGITAL CONTROL - Adjust pressure settings effortlessly with a clear digital display—no guesswork, no extra gauges.

The GamaTech 220V 230PSI Pressure Switch is a durable, digital pressure controller designed for US/Canada markets with a true 1/2 inch male NPT connector. It offers adjustable pressure settings from 0 to 230 PSI, an IP66 waterproof rating, and automatic pump shutoff to prevent damage during water shortages. Compatible with pumps up to 1.5HP, it replaces unreliable mechanical switches with a sleek, easy-to-use digital interface, ensuring long-lasting, efficient pump operation.

Specifications

ASIN	B0BS1SX94W
Best Sellers Rank	#146,324 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #123 in Pressure Switches
Brand Name	Generic
Color	Yellow Faceplate, Green/Black Casing
Customer Reviews	4.1 4.1 out of 5 stars (46)
Global Trade Identification Number	00196852007660
Horsepower	1.5 hp
Included Components	Pressure controller, user manual
Item Dimensions L x W x H	6"L x 3.5"W x 3"H
Item Type Name	Pressure Switch for Water Pump and Air Pump, Digital Adjustable Pressure Controller
Item Weight	9.6 ounces
Manufacturer	Gama Technologies
Manufacturer Part Number	GTSWF-220V230PSI
Manufacturer Warranty Description	1 year
Material Type	Brass, Plastic
Model Number	GTSWF-220V230PSI
Number of Items	1
Power Source	AC
Product Style	Pressure controller
Specific Uses For Product	Residential/Commercial/industrial
UPC	196852007660
Unit Count	1 Count
Voltage	220 volts

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