Engine oil and pressure gauge markings

[1940_owner]

Sending my 1940 vintage gauges off to Keystone for refurbishment and marking for use with my C90.

TCDS E-252 lists:
Note 1 Oil inlet 225° F.
Oil pressure limits:
NOTE 3. C90 Series 30 to 40 p.s.i.g.

My understanding from that (and reference AC 20-88A) is:
Oil temperature gauge should have a radial red line at 225° F
Oil pressure gauge should have a green arc 30 - 40 psig with a radial red line at 40.

Is a normal operating range for C90 oil temperature listed somewhere since it isn't specified in the TCDS?

Thanks,

Craig

 

[bob turner]

 

[1940_owner]

 

[huston marlowe]