I'd just like to say that one of the guys on this board, JeffG, gave me the allied address. When I went there I saw the Hobbs switches for pretty cheap prices. I asked Jeff if they were adjustable and he said yes, that he had purchased one. I don't have personal experience with these switches. I'm still on my original hobbs switch I purchased four years ago at a swap meet. Here is the original post by username JeffG...............
For what it's worth here are some alternative sources or parts that I have used in my own DIY kit.
Nozzles: Mist nozzles from McMaster-Carr. typical PN is 3178K76. They are manufactured by Hago Manufacturing Co., Inc..
http://www.hagonozzles.com/water.shtml
They have a built in filter and a very fine spray pattern. You can even get them with anti drip valves built in. Cost is about $3.50 each
Pressure switches:Adjustable units from ttps://www.alliedelec.com They are made by Hobbs. Typical part number is 611-3021. Cost is $15each. A bit cheaper then the NOS units I have found.
Delivery line: Pre-made NOS line with AN4 fittings on either end. Because I use a 3 gallon tank mounted in the trunk (package tray area) I needed a long line. About $40 from Summit or Jegs.
Pump: I use a fuel injection pump from a VW Rabbit. I yanked it at the local Pick&Pull for $12. This thing has lasted about 1.5 yrs now running Methonal/Water. Not a problem yet.......fingers crossed
I also kicked around a two stage deal. I am using voltage reducing component found on many older (late 80's early 90's) Toyota cars. It looks like a small heatsink with several taps coming out of it. It is used on their fuel pump circuit. Each tap is about 3v. I am using it as an 6v on the fist stage, then 13v on the second. That take two pressure switches.
By the way, that tank is a Jegs unit used in some of the mini drag cars or "Jegsters". It was a bit pricey but a nice 3 gallon unit. $100.
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