Do not buy a TDC PowerBox CR plus for your CRD off Ebay. I bought one for my Patrol CRD and one for my D22 CRD. Not quite 2 years later and they have both blown up. They are not a reliable unit and have both failed in the same way.
Steer well clear of them if you see them on Ebay.
Purchased a chipit unit to replace the one on the patrol and will now do the same for the D22.