zandrewe they all plug in. I don't remeber exactly where but when I did mine a few years ago all the plugs went right into the EX cluster without any modifications or problems. Temp, Fuel, Speed, Odo, tach all work.
the EX cluster is plug and play in a DX! The only issue is the odometer will read mile from the EX cluster unless you swap out the odometer part of the DX with the EX which can be done. Some say this is illegal. It is a gray area because you want to know your cars mileage and using your original...
If you want to go through the hassle if swapping that out but its ten times easier to just swapp clusters...
they arent that expensive... check out eBay... I bought mine there for like $21.00 shipped a few years back.
$75? No tach? :\ Not for nothing cuz it looks good but I bought a CRV cluster on eBay that auto and has a tach, which lights up amber, for only $30.00... just an Fyi... I'm not flamin you cuz if its a DIY it looks good. just wanted to give you an idea of what others (OEM) sell for...