EMP gauge and location

[Piggy]

Starting to see need for EMP. Plus have a empty gauge slot

So EMP...quite new to idea of needing a gauge for it.

What sort of psi are we talking?? 60psi enough?

http://www.ebay.co.uk/itm/52mm-Black-7-C...5d3a4c1a26

not much in way of gauges for tat sort of range of pressure

and where would be best to locate a take off in the exhaust mani for the gauge??

thanks for help as always

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or is it a case of retro fitting a 100psi oil pressure gauge somehow?!