Feel a bit lost without the car to work on, so have been a bit slack. Have spent the time doing a spot of research on ye olde interwobble, trying to track down some cheap gauges. Found some flea bay specials for a very reasonable price - oil pressure, oil temp, boost pressure and a 5" tacho for not very much dollahs. They're el-cheapo snide Autometer clones, but will do the job for time being, which is likely to be one weeks use at speed week - assuming the car lasts a week that is :)