Question about voltage limiter

AJ/FormS said

I built mine from a magazine article back in 1999. The electronic part was about $5 at Radio Shack. I used the factory IVR base and just soldered the part on;easy-peasy. The gauges are rock-solid now and that IVR is still going.At the same time, I put some brighter bulbs in there.

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I completely rewired my 68 fastback w/ an E Z kit. The only thing my limiter controls is my gas gauge. I bought a digital one , along w/ a 3/8" fuel sender, off ebay. Its grounded , but still is sluggish and don`t work right . Ended up using the 3/8" fuel pick up for a return for the fuel inj., any ideas on what I could do to make it read right ??