What dashboard gauges are most useful for a slant?

All I have on Vixen is the stock cluster with fuel, temp, amp and oil LIGHT. I do have a small Sun tach on the left side of the column. I did however later on put an oil pressure gauge under the hood, simply because I was curious. 75 plus cold idling and 45-50 hot idling and it zips to 75 plus hot when I blip the throttle.