Thank you for that link, called Mohawk they said that part has been discontinued, then talked with Gillig they said it was replaced with 51-26117-018 for $70.98. There is a guy that works on diesel trucks close to my house, stopped by there a little bit ago and it said he would replace it with a different one... he gave me this info: "Newstar S-9127 Low Air Pressure Switch, 1/8" NPT, 65-75 PSI Activation" he said it will just alarm quicker but should work. I can get it tomorrow for $27 so going to try it until the Gillig one comes in, will at least stop our air leak.