1969 911T Gauge upgrade - dual oil sender

[blackbird225]

Hello folks. Long time no post. I am finally getting around to finishing up my 69T to S style gauge retrofit. I had the standard gauges with the laughable lack of information. I then bought the two leftmost gauges from a 70S (I think) and sent those to North Hollywood speedo for refinish. I bought an oil tank from a 69S with the sending hole and sending unit, that wire was miraculously there on my car, and I bought a set of rear light units which (also miraculously) had the two wires needed for the oil sender. That's squared away and works!

The oil 'dummy/idiot' light works as well as the oil temperature, but the problem is now the oil pressure sensor. I am trying to figure out what I need to buy. My car has a 73 7R case. What I need to know is

• Which of the sensors I have now is the low pressure light
• Which dual sender do I buy for my gauge? Pelican has an 80PSI unit but my gauge goes up to 100, the middle is 60psi

Is this the right gauge - and where which sensor would I replace to drop this in its place?
http://www.pelicanparts.com/cgi-bin/ksearch/pel_search_2014.cgi?SUPERCAT_FLAG=Y&make=POR&Context_make=&please_wait=N&LastVisited_input=5858&Previous_Section=Electrical&forumid=&threadid=&command=DWsearch&description=oil+pressure+sensor&I1.x=0&I1.y=0