I have a 91 500 SL. About half the time, when I use the turn signal lever, all of my engine dash lights flash on one time. Anyone know what the problem may be?

My guess, a Ground issue or Fuse problem. Check the grounds first

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hum.....
1987 300TD 311,000M Stolen. Presumed destroyed

Those instrument clusters are less than robust. What you experience is what we call "the death blinks" in the shop. There have been a few people that have repaired the problem by finding and replacing faulty components in the circuit board. However I have yet to see one repaired. In the shop we won't dick with it, you buy a new one, not cheap.

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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