thing is, mines for 3 gauges, 52mm ones.
you're having a 60mm defi aren't you?
id go with what you said above... bottom right of windscreen . If you want I could bond the 60mm pod to the lower part of the a piller.. smooth it all in etc and spray it to match.. prob only cost about a score in parts plus your a pillar and defi pod (comes with the gauge)
but surley thats me being nice.. and im not...... am I