A reply from down under. We use a timer localy made by Bogaard electronics. I have one fitted to my 250, these units are able to be intergrated with the alarm systems in fords, with the feature that they will go into full alarm & shut down your truck if someone touches it while it is timing down.can be set from 30sec to 5 minutes.
The Quality of these units is top notch, that Kenworth,Western Star, Frieghtliner trucks have them as standard here.
They are priced at about $200 Australian With current exchange rates approx $160 US
website that possibly help you
Bogaard Distributors
cheers