Retrofit Trip (on-board) Computer on Grand Caravan

I have a 2001 Grand Caravan without the Trip Computer option (I think they were only included on the T & C). I used to have a 300M and with my 2001 I really miss having it.

How do I go about retrofitting one? What parts do I need and/or is it even possible to retrofit an on-board computer for a Grand Caravan?

Hope to hear from you guys!

Cheers
Richard

 

It might be simpler to plug in an ultra gauge:
UltraGauge Automotive Information Center and OBDII Scan Tool

 

Yes I suppose that would be the easy way but I want the oem stuff and also, I need the metric numbers (Im Swedish).