type of bolts used on a Mk2 fuel sender

[Jim Burrill]

Hi folks,'
In the process of opening up two original gas tanks on a Mk2. Luckily, they are sound and no rust through.

There is an AMAZING amount of crap in the tanks though so I intend to take them to a tank shop to be opened, cleaned, and sealed with Red-Kote.

In taking the fuel level sending units and the pickup tubes out, I had some screw casualties. snapped the heads, Some I have been able to grab and remove after the unit was removed, but I still need to drill out a couple and retap.

Question is what thread is supposed to be there? SAE? or BA?

Maybe the bigger question is a rule of thumb for what used BS threads and when did they keep the SAE?

I had generally assumed that engine and tranny parts were SAE and everything else was BSF/BSW or BA.