Anybody out there got the wiring diagram for this little dude?

I was having the typical intermittent problems with my tach so I opened the amp up to take a look. What I found was a couple of components burnt beyond recognition. So I would like to identify the items and replace them rather than dropping 80 bucks for a new one

Joe

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Joe

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1980 300SD - 495k miles - 'The Ambassador'
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Former Family Members
95 C280
73 280SEL
90 300D
87 300SDL (X2)
86 560SEL
84 300D
80 300SD