You get a wide variety of reed proximity switches, can you send me the link to where you sourced it from or the part number so I can look it up.
There are normally three terminals, 1 - pole, 2 - break contact, 3 - make contact.
In your case if it only has2 wires that suggests only two terminals, the easiest way to check if its a make or break contact is to use a multi meter, set it on continuity place the probe on each wire and move the switch and see if you have continuity when the switch is pressed or released.
If it makes contact on release then you can just wire the switch in series of your circuit, so when the switch activates (opens) the circuit is made and when closed the circuit is broken. However if it breaks the contact on release, you need to see if there is a third terminal on the switch, if not you need to buy a different switch as this is working in the opposite way than you require.
I havent heard back from you and just wanted to follow up to see if you needed any further assistance, and ask if you could rate the service received to date.
Hi David, appreciate if you can rate the service received today using the star rating on the page.
Should you need any further assistance please let me know