http://www.rallylights.com/hella/Flush_Mount_LED_Lamps.asp
id use something like that and somewhere along the edges of the mouth of your body kit. like maybe the top of the mouth near the corners.
^^^ yup that stuff holds up. had it on my manifold for about a year now and no cracks, flakes or fading so far. 3 coats of it tho. make sure you use their primer.
i got one of these
not as clean but it does the job
http://www.jcwhitney.com/autoparts/Product/Pr-p_Product.CATENTRY_ID:2000903/c-10101/Nty-1/p-2000903/Ntx-mode+matchallpartial/N-10101/tf-Browse/s-10101/Ntk-AllTextSearchGroup?Ntt=themostat+switch
hey dont know if this will work for z31
on s13. you can drop the steering wheel. then remove the panel in front of the gauge then get to the gauges that way.