TDC sensor is useless unless you have the factory tool to plug into it.  It
is just front of the flyweel and has a wire that hooks to the back of the
alternator (waterboxer).  It does the same thing as the timing light, but
alot more expensive.

Pete
peterz@gte.net
'83.5 Vanagon

>I thought I had most of my engine parts assembled and ready to install when
>I saw in one of my manuals a TDC sensor.  I guess the PO did not install it
>when he rebuilt the motor.  Anyway, I have the following questions.... What
>is the TDC sensor? What does it plug into?  From what I can tell, it is
>installed in the right crankcase half.  Are these expensive?  It seems like
>every time I turn around, I find a missing part.  Any help with this
>question will be appreciated.
>
>Thanks in advance,
>
>Scott
>
>BTW...This is an 81 Westy.