87 300D NO tachometer-NO A/C-ABS problems///Good fuse in OVP relay///Bad relay????

[davidlee]

I have a 1987 300D and my Tach doesn't work, my A/C doesn't work and My ABS pulsates some times at low speed when I apply the brakes,and the ABS light is on.
Thanks to this forum I found out to check my OVP fuse and It checked good with no corrosion on the contacts, Do you think the relay could be bad? Was it a common problem, How do you check them?
Any advise would greatly help
Thanks to all in advance.

David Lee , Portland Oregon
87 300D
87 190E 2.3
84 230E Euro