380SL (107.045) V8-3.8L (116.960) (1982)
4 If not, remove instrument cluster and pull off 4-point coupler (2).
5 Connect a voltmeter (measuring range 0-3 volts, AC) to jack 1 and 3 and repeat test.
If the needle on voltmeter deflects when the screwdriver is pulled away from transmitter, the transmitter with its line is in order and the E-tacho is
defective. If the needle is not deflecting, the transmitter is defective or the line to instrument cluster is interrupted.