I am going to replace plastic line with Russell braided line per many of your suggestions. Does it come with a new switch or is the existing hd one being used. Any other fittings required? Any tips on switching them out would be helpful. Thanks.

 

If I remember right, mine came with a new piece that incorporated both the pressure sending unit, and the connection for the Russell line. No problem to install. Teflon tape on the threads, 3 wraps.