My 1983 300SD has a non working Tach. I bought a new tach amp diagnostic module (under garbage can under the hood) from someone that was referred here. The green LED lights up but I get no reading from the red blinking LED. When you put the key in glow with this module, the tach powers up to 6000 and back down as a test. So I know the tach is working. I started looking around and that brings me to where I think the issue is? There is a pickup mounted above the harmonic balancer and I think its broken. I took a pic and posted it here. Is that pickup coil in the right spot. It looks like the bracket is broken. Where is it exactly suppose to sit. Does anyone have a pic of what a working one looks like? I don't even know if there is something missing. Thanks for helping me out.

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Current fleet-
2015 BMW 750i xDrive
2009 BMW 535i xDrive
2004 Chevy Avalanche 4x4
1993 Mercedes 300SD
1993 Mercedes 300SE (parts car)

Previous Benz's-
2001 Mercedes SL500
1983 Mercedes 300SD
1980 Mercedes 300TD
1996 Mercedes E300D
1999 E300DT
1984 300TD-T
1988 Mercedes 560SEL (parts car)
1979 300SD
2003 E500
2004 S430 4Matic
2001 E55
2003 E430