If you have a full sized spare tire, buy new non sending unit plain valve stems
for all 4 tires.....take the sending unit valve stems out and replace them with the
regular valve stems... break the bead on your spare and then just chuck the sending
unit ones into the interior of the spare tire...pressure it up with all them little devils
inside at the happy required pressure and smile big. If you get a low pressure
alarm, check your spare tire...done.