How hard to replace IVR on 67 Valiant?
"Here's the thing." You could probably do it in the car, but that might not be the whole story. On my own car, the following was all wrong with the cluster:
IVR was bad, but worse, the spring contacts forming the socket were not making contact with the PC board. Solder jumpers across
The indicator/ lighting needed attention, a couple of "blown" bulbs, corroded PC traces where the sockets connect, bend and clean the socket contacts, etc
The stud nuts on the gauges were loose, causing both to be inoperative, even after fixing the IVR
The harness connector pins were loose or broken. I elected to just do away with the factory connector, and used a pair of Molex style connectors. It is possible to fix the pins, and there are folks making "repop" PC boards.
Also, you should add a pigtail ground from the cluster board ground and bolt this to either the dash frame or the column support.
Read through this, has a lot of good ideas on repair, including the IVR contacts
Printed circuit pins repair
My not so neat IVR socket repair
"Here's the thing." You could probably do it in the car, but that might not be the whole story. On my own car, the following was all wrong with the cluster:
IVR was bad, but worse, the spring contacts forming the socket were not making contact with the PC board. Solder jumpers across
The indicator/ lighting needed attention, a couple of "blown" bulbs, corroded PC traces where the sockets connect, bend and clean the socket contacts, etc
The stud nuts on the gauges were loose, causing both to be inoperative, even after fixing the IVR
The harness connector pins were loose or broken. I elected to just do away with the factory connector, and used a pair of Molex style connectors. It is possible to fix the pins, and there are folks making "repop" PC boards.
Also, you should add a pigtail ground from the cluster board ground and bolt this to either the dash frame or the column support.
Read through this, has a lot of good ideas on repair, including the IVR contacts
Printed circuit pins repair
My not so neat IVR socket repair