OM617A Tach Amp
http://www.peachparts.com/shopforum/showthread.php?p=1829401

Tach Amp Question?
http://www.peachparts.com/shopforum/showthread.php?p=977714

How the Tach Amp works
http://www.peachparts.com/shopforum/showthread.php?p=1690483

adding a tach to a 240D (standard tranny)
http://www.peachparts.com/shopforum/showthread.php?p=502477

Where is the RPM sensor on a W123 diesel?
http://www.peachparts.com/shopforum/showthread.php?p=712583

Tachometer Amplifier Schematic?
http://www.peachparts.com/shopforum/showthread.php?p=145324

1985 Federal 300D Tachometer Repair
http://www.peachparts.com/shopforum/showthread.php?p=1481907

Designing a Better Tach Amp
http://www.peachparts.com/shopforum/showthread.php?p=1701546

Tach signal ?
http://www.peachparts.com/shopforum/showthread.php?p=402132

Tach installation in a 300D
http://www.peachparts.com/shopforum/showthread.php?p=1419358

Tachometer Woes
http://www.peachparts.com/shopforum/showthread.php?p=2090706

Tach compatabillity
http://www.peachparts.com/shopforum/showthread.php?p=1810507

Tachometer
http://www.peachparts.com/shopforum/showthread.php?p=265440

When I blow my horn, my tach pegs
http://www.peachparts.com/shopforum/showthread.php?p=2024854

tach amp wire colors for wires 2,3,6?
http://www.peachparts.com/shopforum/showthread.php?p=1764122

TDC transmitter (crank position sensor) - a road to nowhere
http://www.peachparts.com/shopforum/showthread.php?p=1905616

phantom tachometer
http://www.peachparts.com/shopforum/showthread.php?p=333707

84 W126 - How does Tach Work Internally
http://www.peachparts.com/shopforum/showthread.php?p=2035237

can someone ....
http://www.peachparts.com/shopforum/showthread.php?p=1364446

EGR in 1985 Kickpanel.... Utoh... ZOINKS!
http://www.peachparts.com/shopforum/showthread.php?p=1538160

Need tachometer help on 85 300D
http://www.peachparts.com/shopforum/showthread.php?p=946402

Tachometer fix .... more swank than cigarette butt.
http://www.peachparts.com/shopforum/showthread.php?p=283247

Tachometer pickup?
http://www.peachparts.com/shopforum/showthread.php?p=448663

Location of Tach Amp on w123?
http://www.peachparts.com/shopforum/showthread.php?p=607944

Does a Tach. sensor actually count RPMS or just generate a voltage?
http://www.peachparts.com/shopforum/showthread.php?p=1854130

Location of tachometer amplifier in W124
http://www.peachparts.com/shopforum/showthread.php?p=1338331

Tach amp fix in early 123's and 116's
http://www.peachparts.com/shopforum/showthread.php?p=1696611