After my engine failure, due to a faulty/weak fuel pump (leaned out), I am installing a fuel psi gauge on my dash. I know how to connect this one, but I`d also like to install an oil temperature gauge and water pressure gauge.
Where do you plumb in the oil temp gauge? Same place as oil psi gauge?
And...I have absolutely no idea where / how to connect water psi gauge....please advise.

water psi should goin the blockdrain on either side of the block.
plumb oil temp in before cooler, there is a spot on the remote filter housing.

Ever consider EGT's? Sure would let you know immediately when you are getting a lean condition. Like ALL guages, they are only any good if you observe them.

EGT gauge. OK, I`m game. Great idea! So where does this plumb in?

You have to... are you ready for this! Drill into your exhaust! If you have headers you'll need to send them in and have some bungs welded in.

for the block drain put in a tee and put drain back in.
if water freezes in pressure line you'll be buying a new gauge