Dirty Ditch Dawg

my oil sending unit has been leaking, from the top of the sensor, so i
replaced it today, with the starter,
with a auto-meter machanical gauge, as the dam sending unit
was only 10 dollars cheaper, than the machanical setup, and i think the
YJ gages are crap,
(im building an insert out of aluminum, on my mill,and anodizing it, to
replace the center pod with the new gages)
,
any ways,
2.5L 4-mouser
my question,

1-at an idle speed of 1200rpm what should the oil pressure be?
what would it be at say 2200 rpm ?
2- can one use the original wiring harness wires to hook up
an aftermarket (auto-meter) gas-gauge and engine-temp, Volts,
ect, by splicing into the harness?


,
johnp