>
> Interesting, I’ve only seen that term used here on the 2.1, and the
> Bentley just refers to them as “temperature sender.”  Confusing, they are
> two different systems with one sensor each.
>

Digijet (1.9l) and Digifant (2.1l) employ the same set of senders: air
temp, coolant temp, air flow, closed-throttle/wide-open throttle, rpm/TDC**
(plus oxygen sensor for closed-loop operation).   I can't tell you offhand
where the Temp-I (air) and Temp-II (coolant) terminology came from; it's
been in use on the Vanagon list forever.

**Digijet uses the distributor signal to authorize the fuel pump;  I don't
know whether it takes engine rpm into account in its calculations.
Digifant does this as well but also of course completely controls ignition
timing based on the 5BTDC signal from the distributor.

Yrs,
d