I've got my oil temp sender bolted firmly into the sump. This does mean it reads a little lower than the highest point during it's journey around the engine/turbo. I tend to see mid 70s on light cruises, 80 degrees on slightly faster runs, and last night I had it to 90 degrees on a fast motorway uphill run.
What gauge are you using? I got quite a tasty SPA gauge so I can monitor coolant and oil temps on the same 52mm pod.
Oil does take a long time to warm up too. I noticed this as I used to think it was safe to use more throttle when the coolant needle started lifting off the bottom. Then I found out the coolant is actually only about 40 degrees at this point, and oil still down at around 25 degrees. Now I usually wait for the oil to reach 40 degrees. The car feels a bit more eager to move when the oil reaches this temp.