Ahh. Only prob is I'm trying to keep the car original. I'm might order new oil pres and temp sensors if there is not a way of checking the sensors? Once sensors are eliminated I'll do resistance test on wiring then failing that. The guage set.
its more than likely the gauges themselves jamie or a dodgy earth connection to them which will send the needles straight round to max.
if i were you i would locate the main earth wire in the multiplug then cut it and solder in another short lengh of wire to a good earth point behind the clocks
hopefully that should sort it