I'd go out and get a third realy. Measuring is great and all but it's hard to beat seeing how it will work when all the components are there.

If you want some ideas/inspiration check out these guys.
Some prety cool stuff.
<img src="/forums/images/graemlins/cheers.gif" alt="" />

"If you can't learn to do something well, learn to enjoy doing it poorly".

85 22RE, 5spd 4Runner project
87 Turbo Truck, Boost Controller, otherwise stock... for now.
86 Turbo 4Runner, Project