Looks nice from the pictures. Yours is a 92 so it will have metal oiler tubes for the cams but it does indeed have plastic timing chain guides. $3000 is not a bad price at all. Typically when the oil pressure sender fails it either reads zero or 3 bar at all times. Honestly I think your pressure is fine but I might be inclined to change the oil and use 15w40 Shell Rotella T.