E38.org/E32 has all of the info and links.or here,http://manualspace.com/manual/search/1990-BMW-750il-shop-manual.htm
in the gas tank
where is the starter
on my 89 its under the rear passenger side seat
The fuel filters on the 1990 e32 750 are right behind the rear wheel on the right hand side, there are two of them.
schematic for 1990 cougar ck www. autozone.com. look for tech support area one place has all of such for many cars.
A schematic can be found in a 1990 E250 service manual. The manual may be available at the local library. Or, it may be purchased through most auto parts.
The manual has a very nice detailed schematic and can still be found in most major auto parts stores.
There is a schematic on the fan shroud. If not go to a used car lot and find a like car and draw a schematic,
Any repair shop with Mitchell1 or Alldata will have access to those wiring diagrams.
I have schematics but they are broken down into sections, if you let me know what you need I wiil try to help out.
Ignition relay is probably shot. It is in the power distribution block in the motor comprtment.
If the speedometer stopped working on a 1990 Cadillac Seville, it could be the fuse or an electrical problem. First check the fuse and if the fuse is good, check with a mechanic.