I'm going to be running a Weldon 2015 external pump and I still want to use a sending unit in my new sumped gas tank so that my VDO gauge in the GNX dash shows the correct fuel level. Is there a difference from the non turbo Regal fuel tank sending unit compared to the turbo cars? I'm not running a pump in there. Reason I ask, Inline Tube sells the 78-87 non turbo Regal sending unit for $115 while the turbo Regal sending unit is $289. All I will be essentially using the sending unit for is the float level.