I was planning on using some steel tube with a nut welded inside on the end as an extension bar, so that the indicator will bolt to the tube (assuming yours have threads), then some how fix the steel tube to the front frame of the chassis in a similar way.
Something like this...
I've got some tube if you need some (came with my chassis kit for the rear alu tub, so won't be needing much of it). If you want a bit, give me a shout.
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My Build Diary -
http://davesroadster.blogspot.com/
*updated 7/6/11*
Best bit so far: Getting it running
Worst bit so far: Cutting steel for wishbones and engine mounts.
Most annoying bit so far: Generator packing up half way through welding.