If its from a 1998 car its a Gems EFI system made by Sagem.Its quite acceptable to do away with the circuits of the ecu that control immobilisation in conjunction with the BECM in the Range Rover.But you will need road speed input which came from the ABS ecu and was trimmed by the BECM and fed around various ecu's.Also alot depend on what gearbox you want to use,manual or auto.Quite alot of hassle,doable is it really worth it ? The cheapest easiest way around it is to use a distributor type front cover off a later 3.9 v8 Disco and get an engine loom and ecu off the same car.All nuts and bolts conversion,and there are plenty of them in breakers etc.
If you want to do a really nice job and not go back to having a distributor,the nice thing would be to use all the original GEMS sensors - except the MAF,(Which is a £700 odd part to replace - the cheap ones are rubbish.) which is replaced with a MAP sensor instead.Totally tuneable and none of the security issues,plus you can run it with wideband UEGO oxygen sensors for total control of air/fuel mixture - top of the tree stuff.Their Megajolt ignition system will run off the original crank sensor and use the existing coil packs.
So there are three ways of making it work,the second and third are probably favourite,depends on how much work you want to do and how much money you want to spend.
