hello from blighty... I've been trying to connect a tachometer to my W108 280SE 3.5 (M116) by connecting to the - side of the ignition coil but have been unable to get a signal. Does anyone know if there is another terminal I can use to get a reading?

cheers.

__________________
1993 320TE M104
---------------------------------------------------
past:

1983 230E W123 M102
1994 E300D S124 OM606 (x2)
1967 250SE W108 M129
1972 280se 3.5 W108 M116
1980 280SE W116 M110
1980 350SE W116 M116
1992 300E W124 M103
1994 E280 W124 M104
----------------------------------------------
"music and women I cannot but give way to, whatever my business" -Pepys

Connect it to the + side of the coil, the – side is the ground (0 volt).

Rob

They also make a tach that i think hooks up to ignition wires for distributorless systems

__________________
1984 300SD Orient Red/ Palomino
1989 560SEC
2016 Mazda 6 6 speed manual
1995 Ford F-150 reg cab 4.9 5speed manual