Just make sure your tach and speedo are up to par maintenance wise. Bulbs, etc. are good. Because once you install that dash cap you will NOT be able to remove the tach and speedo. I have tried several times to remove mine with no luck!
And the cap won't fit without some finagling. Mine required heat to make it fit "better", not perfect by any means. To this day I wished I had just covered all the cracks with a dash mat instead of a cap. Was lazy and had an upholstery shop, that a friend recommended, do it and they put freakin' silicone all over the dash which is incorrect. But I didn't find this out until I made an attempt to remove it at a later date!
Biggest mistake I've made with this Z besides the cowl induction hood, which is going away soon.