fuel gauge folly

MoparMike1974 said

You do not need to change your IVR when running a meter match. It has an internal regulator to power the fuel gauge. They say its only rated to run one gauge so you would need to use your existing IVR to power the temp gauge. So some modifications will be required to isolate the two.
You can buy those "calibration box"....its called a resistance decade box. https://www.amazon.com/dp/B00023RTZO/?tag=fabo03-20

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This idea doesn’t really make much sense. The IVR is located IN the fuel gauge. It would be difficult and pointless to try and isolate it. Why would you completely disassemble the dash and go to the work of isolating a 50 year old mechanical regulator that is known to fail?

Makes much more sense to replace the ivr. The meter match with the built in regulator is a cool thing, but likely designed for when you are not using the other stock gauges.

$90 for a decade box? Mine cost about $10. That one would likely burn up anyway. Most are less than 1/2 watt capacity. Fuel gage pulls about 1/2 an amp at full. On a 10 ohm resistor that is about 2.5 watts.