Add on Gauge Cluster mounting locations

I have a 67 RT and am wanting to add a volt meter at a minimum or maybe a typical oil/water/volt cluster. Should i do the 3 cluster or just add the volt only? Either way.....any pics of where you guys mounted add on gauges?

Since I do not smoke, I removed the ashtray and made a plate to mount 2 guages there.

I made a plate for the radio hole for a mechanical OP gauge (no radio). Could fit at least 2 gauges there.

I don't use my glove box so I put two gages in there. When I need to see them, I just pop open the door.

thanks for the replies.....i really like the idea of removing the ashtray and installing them in there. I may have to try that out