Ken,
Nice looking fabrication work!! 
The oil pressure on the D640 in my 1782 can get as high as 80 psi when it is cold... after it warms up it is about 30psi at hot idle and 50 psi at full throttle when hot... hope this helps!
__________________
Jay
40 years of Using and playing with IH Cub Cadets!
Proud owner of the following:
Cub Farmall, Super A Farmall, Original, (2)70's, 72, 100, 102, 123, 105, 125, 127, 108, 128, 1450, (3)782's, Yellow 982, 1782, "Sam's" 2182, M Farmall and a #7 trailer
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