Do I have to drain fresh water tank to change switch

No. I disconnected the pump from the RV and a small amount of water dripped from it onto a towel I had placed under it. The tank is under the floor and isn't an issue at all.

Has anyone used this pressure switch on Shurflow 8000-543-236,

Ours fit properly and worked well

Will this pressure switch fit the Shurflo 8000-543-235?

Chances are it will, as Shurflo uses the same switches over a variety of pumps, but I suggest you do some googling and check for yourself.

Will this pressure switch fit the Shurflo 4008-101-F65?

According to the parts sheet that I pulled up that is the correct part good luck

Shurflo | Desertcart UK

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Specifications

ASIN	B017PKCVKE
Auto Part Position	Unknown
Automotive Fit Type	Universal Fit
Best Sellers Rank	#68,069 in Automotive ( See Top 100 in Automotive ) #53 in RV Water Pumps & Accessories #25,380 in Automotive Replacement Parts
Body Material	Plastic
Brand	SHURFLO
Customer Reviews	4.6 4.6 out of 5 stars (237)
Date First Available	November 7, 2015
Exterior	Machined
Fit Type	Universal Fit
Gas Type	HURFLO
Global Trade Identification Number	00752324011063
Inlet Connection Size	5 Inches
Inlet Connection Type	Hose Barb or Threaded
Item Weight	1.6 ounces
Item dimensions L x W x H	8.5 x 5 x 1.25 inches
Item model number	94-800-05
Manufacturer	Shurflo
Manufacturer Part Number	94-800-05
Model	94-800-05
Mounting Type	Tank Mount
Operation Mode	Manual
Outlet Connection Size	5 Inches
Outlet Connection Type	Threaded
Product Dimensions	8.5 x 5 x 1.25 inches
Product Grade	New
Specification Met	OE
Style	Modern
UPC	752324011063
Vehicle Service Type	Truck, Boat, RV

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£23.65

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SHURFLO

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