When mine was done they drilled and tapped a 1/8th hole under the IC in the boost housing.
But the boost gauge using thin teflon tubing, it had broken the tubing and playing havoc with
the boost, I would never have noticed it broken if not for changing the glow plugs last week.
I've purchased a heap of 1/8th brass fittings and some silicon tubing with clips, so when it
all arrives I'll re-plumb the Dawes, should look neater than what I have now.
and last longer too