hi everyone right iv got a problom with my daihatsu fourtrak its a 2.8td its f reg so she getting old. and it wont go into 4 wheel drive im just wondering if anyone has had the same problom or if you new how to resolve it it has manual locking wheel hubs iv tryed putting it into low range iv locked the hubs in and iv pushed the switch in on the dash but the light on the dash doesnt light up but there is a relay or something that clicks wen you push the button in there are no noises coming from the gearbox or front n rear diffs when being driven iv had the switches out of transfer box iv checked them and they all seem to work iv cleaned up the connections iv inspected the vacum pipes for splits and i cant seem to find anything wrong with them. so im sort of stuck really i dont know wot else to try as im not that clued up with 4x4s my dad had the vehicle before me and it worked when he had it. iv also checked the fuse box for any blown fuses and i cant see any that are blown. also what sort of engine oil do i use fully synthetic?? as i want give it a service any advice and one last thing there is a light that usually lights up on the rev counter that shows wen the turbo is on but its stopped working i think that the little vacum senser next to the air filter box has given up the ghost could anyone tell me where i could get a new vacum senser from? any advice would be welcome.