3 The Z28 we are working on features a pretty decent gauge cluster with a 150 mph speedo and 8,000 rpm tach. The cluster also has a temp and fuel gauge and a clock. What's missing from that list is an actual oil pressure gauge. Even though this cluster has a decent selection of gauges, the years have been less than kind to them. The temp gauge doesn't really work, all the numbers are a little faded, and let's face it--these are all built with old technology.