Water temp and oil pressure gauges.

I don’t know if there are 10-80 Ohm aftermarket gauges that would work with an oem oil sender. I think most are 10-180 ohms as I recall.

Probably cheaper & easier to go with matched aftermarket gaugE and sender.

There isn’t much room on a small block for two senders. It can be done, but pretty hard to avoid vacuum can on distributor.