I'm looking at an '86 560 wiring schematic. It's pretty hard to track everything down, but it appears there is no thermo time switch on this later model. The temp sensor you want is a dual unit, with one input going to N3 - the kE control unit, and the other going to the ignition module. It may be the same one as on my 103 engine. On mine, the sensor sits at the back of the head, it's round, with 4 terminals. It is tested by checking resistance across opposite terminals (1st-3rd base, home to 2nd base). Should read about 1100-1200 at room temp, about 300-400 at 80C. There are two other single sensors, one for the fans and one for the gauge.

Tracing around further, I think I found the "starting valve". It's tied to a 3-way relay N16-2, the fuel pump relay with cold start valve control and kickdown shutoff. It actually appears the cold-start valve is tied thru this relay to the starter, and may only run when the starter is engaged, as you said.

Don't quote me on this, this schematic is really small and complex, but this may help.

Good deal on the pressures; I guess the V8 would logically need nore gas than the six.

DG