I am about to commence on swapping the engine management on My 1990 1.9 from clock work to the motronic setup I removed from a zx Volcane. I have been studying the Pin out diagrams and I am stump ed with the way I should tackle two parts.   Tachymetric relay, do i just use the jetronic Relay or replce it with the Double relay from the ZX?   And secondly the SAD, from the 205 wiring diagram in the Haynes manual it looks like it has a connection to the ecu which is not the case on the ZX diagram, it looks like it has a connection to the Double relay?   Any advice would be greatly appreciated so I can get on constructing the new loom.