I don't think you could use oil pressure for brake pressure.
Brake pressure is wayyyy higher.
As for me, I run a tack on the column, mech water, mech oil press and mech fuel press(oil and fuel out on the cowl. fuel lines cannot run ito the pass compartment)
Speedo is factory, and so is gas gauge.
No voltmeter,(if it starts, it has enough) no trans temp (it won't get hot enough to worry about on most bracket cars)
I've always(and will always) question the accuracy of electrical gauges. Made in taiwan peices, jammed into a made in usa case. Lot's of variables in electrical items that can go bad.
No disrespect to you on that one goody, just my .02
