Tachometer question and oil pressure guage

[95hatchcx]

I have a 95 hatch cx with a b18B, where do i tie in my tachometer wires
into?

What is the difference between a mechanical oil pressure guage and an electrical
oil pressure guage? which one do i need?

 

[h22bubbleback]

u have to splice into a distributor wire..forget which one