Join Date: Jan 2005
Location: San Juan Capistrano
This is a great posting - thank you for publishing your research!
I delved into this a few months ago, when I was building my '66 Sprint GT with a 2 liter conversion. I naively kept the later oil pressure sender in the 2 liter block (hey, it looked like the 1600 sender), and was puzzled why the oil pressure gauge wouldn't work. A lot of fooling around with multiple oil pressure gauges and senders taught me that the early 105 gauges work in the opposite manner as the later gauges; that is, on the early gauges low resistance in the sender produces low pressure readings, high resistance = high pressure. The later gauges & senders reverse this relationship.
I got my gauge working properly by locating an early sending unit - it never occured to me that VDO might sell a new sender with the right characteristics.
San Juan Capistrano, CA
'63 Guilia spider
'65 Guilia Sprint GT