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Not sure which type of gauge you have but I had a similar problem. My gauge is a actron and the pin inside of Ford adapter was missing. I was able to order a replacement adapter at Actron® for just $2.50. Went ahead and ordered two shipped for less than $12.
Pretty sad when shipping is more than the needed part... Take it back get another one. If it's the same CALL them and they SHOULD send you a proper replacement for free.
Not sure which type of gauge you have but I had a similar problem. My gauge is a actron and the pin inside of Ford adapter was missing. I was able to order a replacement adapter at Actron® for just $2.50. Went ahead and ordered two shipped for less than $12.
Don't know the brand offhand, I use it on my buick grand national, it has a -4AN fitting. Looks like the valve on the F250's fuel rail is much smaller.