I've done a lot of pump work on my car and I set the timing by "ear". It's not scientific but it's worked so far. I was getting a burst of clatter upon initial acceleration which indicated far retarded injection so I just advanced it little by little until the clatter went away.

I'd really love to get one of those acoustic interfaces to do a proper job of timing it though but their several hundred dollars.

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-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250