While at Autozone tonight I looked up parts I used to make an adapter to connect 1/4" vacuum line to a R134 charging hose (to vacuum my A/C systems): #323080 male M12 to female 1/4 NPT #323317 male 1/4 NPT to 1/4 hose barb Assuming you live near an Autozone... Re: low pressure cutoff switch thread -- of course it is located on low side of orifice tube (passenger side of car). To everyone who eMailed me Re: A/C -- remember to jump the compressor when flushing and charging. The low pressure cutoff switch won't engage the clutch otherwise. Don't jump it when vacuuming. If anyone's interested, my D is no longer constipated. Replaced EVERYTHING from the fuel filter forward tonight. And I now have a proper Bosch fuel pump w/ check valve (no more hot start issues!). Bill Robertson #5939