Re: 48-50 Bimetal Senders Retrofit Project

Posted by HH56 On 2024/5/4 19:07:50

If you can do without a trim pot and shrink the board to a small enough size you could make something that would mount directly on the two input studs on back of the gauges. Power would then be readily available and with addition of a pigtail to a nearby screw to provide ground, would be self contained. The sender wire could be removed from the original gauge connection and placed on a new terminal on the board with the connection back to the gauge being also used as part of the mounting. Use an easily found and commonly available modern range resistance sender used on many aftermarket gauges such as the almost universal S-W range of 33-240 ohms.

I think you would need some kind of protection on the sender input as all the EMF noise or spikes in the car could easily be picked up by that long unshielded sender lead. If the components are CMOS might also need extra input protection for probable static generated by poor handling when connecting wiring, particularly if working with the sender at the gas tank.

Here is the back of a 22-23 cluster that BDeB posted some time ago.

Attach file:

---

  22-23 cluster.jpg (206.16 KB)