I just put together my 91 300SE after pulling the head for a gasket change and the lower front cover for timing chain tensioners and crankshaft seal.
I can't find where to connect the three socket electrical connector from the TDC sensor on the front of the crankshaft.
I have an extra vacuum line from the forward vacuum unit on the r/h fwd engine bay, I thought it went to the air pump but I can't find a connection.
I have an extra shim? I think it's from the area of the belt tensioner.
Any assistance appreciated. Embarrassing but true.

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The connector plugs into the bottom of the round lambda test port seen in the picture. You have to take the two 10mm nuts up to get to the bottom of the connector.

You have two vac lines on the right side. One is for the egr valve, the other for the air injection diverter valve.

That shim I don't recognise, don't think it belongs to the car.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff

thanks,
where is the diverter valve?

Found the diverter valve, thank you.

That shim looks like it's for either a door alignment or frontend alignment shim. I don't believe it was part of your head gasket job.