I thought about connecting my OEM dash gauges, and I even built an interface board, but I decided to use the Holley digital dash.
I made a cluster with LED idiot lights that also has two red LED three digit displays instead. This way I still have a blue bright light, turn signal, and multiple warning light indicators.
My battery is on a large 3 digit meter and has a red or green LED above it. It is green when charging, blank when anything below charge voltage down to about 75% charge, and red when less than 50% charge.
I haven't decided what to use the second three digit display for. Likely water temperature or fuel.
I put 5 or 6 LED's (that can each be red, yellow, or green) across the center. They can be triggered from the Holley, or they can independently operate from the Holley sensors. They bridge the sensors with hundreds of thousands of ohms impedance, so they cannot affect sensor function.
I find warning lights much more effective than gauges, the only gauge I watch is a tach.
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89 LX. 363, single turbo, Super Vic EFI, TFS high port heads by TEA, solid roller, glide. Holley HP EFI. (exact combo varies)