One is only for the information in the cluster, that has no connection to the ECU's. Then there is one which is bigger, that one sends the signal to both ECU from one connector. And another one. Details are in Bentley how to check them.

see items 5,7 and 8

This is from an 1988 M70 engine, but the measuring data are interesting for you, see under coolant temperature sensors
http://www.e38.org/e32/750ilpinout1988_90.pdf

E32 750iL 11/88, E32 750iL Highline 03/90
7 series Tech tips URL:http://tinyurl.com/3486c

• Need help from a fellow 750 owner.......my car's fuel mixture - eliasazem 2008-06-09 16:20:37 (76 views)
  • 2.4 litres an hour (nt) - alv12 2008-06-09 20:43:41 (49 views)
    • Did you get this reding with the engine cold or warmed up? (nt) - eliasazem 2008-06-09 21:15:31 (47 views)
      • warm it goes from2.3-2.4 I will try it when cold and let you - alv12 2008-06-12 23:34:25 (39 views)
  • Try this also--charcoal canister breather valve - Patrick C 88 750 160K 2008-06-09 17:12:41 (85 views)
    • Just found out that PO removed the whole system :( (nt) - eliasazem 2008-07-02 14:09:13 (25 views)
    • I'll also give it a try...thanks Patrick (nt) - eliasazem 2008-06-09 19:40:55 (46 views)
  • that is liter per hour consumption - shogun 2008-06-09 16:55:30 (69 views)
    • I mean to adjust my idle consumption.....maybe I can get - eliasazem 2008-06-09 19:35:25 (45 views)
      • multimeter, read the values by measuring (url) - shogun 2008-06-09 23:54:25 (61 views)
        • details what you should get as data (url) - shogun 2008-06-10 00:10:28 (54 views)
          • Did a auto data scanning today and foud out that I had a bad water temp sensor - eliasazem 2008-06-11 20:06:42 (64 views)
            • yes, there are more than 2 coolant sensors (url) - shogun 2008-06-12 19:29:36 (58 views)