Came across deal of the century on some V35 EL gauges. These are out of the USA and cost an unbelievable US$58 delivered.
http://www.ebay.com.au/itm/03-04-G35-MANUAL-A-D-D-Angel-Gauge-Gauges-INFINITI-/200625226623?pt=Motors_Car_Truck_Parts_Accessories&hash=item2eb632037f
Arrived in a few days from paying and fitted them today - they are freaking awesome!!!!
They are to suit a 260km/h speedo (for the inner km/h bit), but conveniently the MPH scale on the outside goes to 160mph, so is not dissimilar to the V35 180km/h max speed. And especially since my speedo used to run around 10% off (due to my 265/35 tyres), this works out perfectly - the MPH speed almost perfectly matches my km/h speed.
Took under 1.5 hours complete to install from go to woah, having never removed a cluster before. Trickiest bit was getting the EL thingo over the gauge needles - but got there eventually.
Enjoy the pics.