autometer gauge install

[GhettoPop]

i'm installing volt, oil press, and water temp gauges, all elec, under my stereo in that wasted empty compartment. got a few questions:

1. i know the stock water temp sender is on the front driver's side of the intake behind the distributor, can i simply use a t-connector to use stock and autometer gauges? will this somehow cause an inaccurate reading for one or both? am i better off drilling a hole in the water neck? where is the best spot?

2. i think the oil pres sender is near the drivers side front of block next to timing cover. will a t connecter work here too?

3. where are the best places to hook up the gauges to the ignition switch, dash lighting circuit, and gauge light ground?

any advise or pics would be great, thanks.