I only know of these being installed by the manufacture (ie on a Toyota, Mercedes etc). I don't know of any aftermarket sensors that could be installed and then flipped on with a switch.
If you log onto the Aston Martin Owners Club forum www.amoc.org/ and enter the V8 Vantage page, someone has posted a complete review of a front parking sensor they purchased from a third party company. The report also includes a web link to the supplier. They had them fitted on a V8 but it's also available for other AM's
Hope this helps
cheers
Alan
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