if u can get a harness then they are well easy to fit. there is a wiring loom under the steering column all you have to do is un plug it, plug in the turbo timer harness, connect it back up - earth the turbo timer, connect up the wire that goes to the handbrake (if it has the security feature available) also if it has the boost gauge built in just tap it off the sender under the bonnet...
should take about 30 minutes - i'm no mechanic or electrician & it was easy to fit!