Hi Rob,
I have a Motometer (3 in 1). Amps and fuel work.......oil temp don't:(
I do not know the sender type other than it fits in between the case and the normal oil pressure switch.
In my 'Bently' manual it states that the opening temp for the thermostat (bellows) that operated the throttle ring at the back of the fan housing was originaly 75 - 80 degs but was reduced to 65 - 70 from
engine no: 3930189.
Also; in the oil circulation section (technical data M-8 pge3) there is reference to correct oil pressure (SAE 20) with engine at 70 degs (158F) 2500 rpm
So I'd say normal running oil temp was around the 70 deg C mark.
Hope this helps
Stock......the new custom