Macraja

Hi where A?C relay is located on 1984 Nissan 720, Z24, 4x4

I diid hook meter. I do get 12 v in # 2 wire when ignition is on with # 3 ground, I also get signal in # 1 wire from resister.

I did take gauge out. Blow dust out with compressed air at 5 PSI. Looked at solder joints. Needle moves freely. Nothing visible crack. Reinstalled gauge . same issue it did not work. Installed another OEM tach. This one does not work. No needle movement when truck started.

Hi I have 1984 Datsun 720, Z24, 4WD. My OEM tach quit working. I replaced resister with New OEM. At the three prong plug ( that plugs into the back of OEM tach)I have 12V in one leg when ignition on. I plugged tachometer in other two legs and it does register RPM. Any suggestion please. What I meat to say is that when disconnected oem tach ( three prong plug) # 1 wire from resister, # 2 wire from ignition when hot and I assume # 3 wire is ground,I hooked up external Tach/ dwell meter from Sears to # 1 and # 3 Tach/dwell meter did work.,