So your original 8s elec style? New one has capillary(brass/copper) tube? We went with aftermarket triple gauges mounted under ac vents. Specifically went for elec on temp gauge. Cut wire to exact length. Can just replace sensor(and we did) with elec setup.
I have one of those thats not the problem the problem is the new gauge has a built in sensor that won't fit in my intake I have the original style sensor.