Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Are you using the MSD Atomic EFI?
I would run an external surge tank system and keep the original sender.
A low pressure pump can feed the surge tank. Excess from the tank goes back to main tank.
MSD pump draws from surge tank.
Your new sender must not be compatible with your gauge.
Have you had any thoughts about my suggestions?
A lot of high powered cars run a surge tank system.
It is the way I would do it.
My answer to you was to keep the sender compatible to the gauge, now you have a sender and gauge that aren't compatible.
I'm a mechanic and a telecommunications tech, so I know electrics VERY WELL.
Are you a mechanic also?
Do you own a resistance box, where you can dial up an EXACT value of resistance, to check gauge operation against manufacturers specs?
Do you have the senders resistance versus float arm height specs?
I wish you luck in how you solve this.