Wow! You are getting totally stroked. I know you are in a bind, but you need to find someone else. That is a complete rip off. $8K??? They should be jailed. I think your driver side rear wheel sensor is gone since your speedo isn't working. If it is running and working, start doing some searching about getting your own scanner that will do misc modules. My Creador 310 will read wheel sensors to see if they are operational. Run away from that "dealer" as soon as possible.

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Dave S.
Northeast
2003 4.6is
2005 E53 4.4
2003 E39 Msport(a REAL ONE!)
1959 Fiat 600