I hollowed out an old sparkplug and made a device to check the TDC mark.
I found an old rod that fit snuggle in the middle of this spark plug and
screwed it into #1 cylinder. I then attached a wrench on the pulley nut
and rocked it  back and forth around TDC while watching the feeler follow
the piston up and down. TDC appeared right on the money .
Good Luck & Drive Safely
Ken Lewis , Kernersville NC <Heart of the Triad>
86 VW Transporter Three Door Pickup (168K)
60 Porsche T5 Coupe
85 VW Vanagon (Elvis) presently awaiting engine

On Wed, 3 Sep 1997 02:59:19 UT Tom Brunson <TABRUN@CLASSIC.MSN.COM>
writes:
<snip>
>wonder how close the pulley mark is compared to the TDC sensor and
digital test
>rig that
>VW uses. (I've also compared two timing lights - same result.)