1) replace the thermostat for a new Standard one.
also you may be surprised to find genuine should be a competitive price.
Don't use a hi flow thermostat unless you have a mods to suit, I tried that approach and it actually ran to hot.
Personally don't like the idea of just routing the coolant to converter then heater core then finally back to block.
Winter you will probably notice cab not as comfy as it should be.
Coolant re-entering the block will be to cold all year round.
If it was best practice to do it that way it would be done that way instead of using a tee pce.
There will be a whole host of reasons why the T is used and not plumbed without it.
Just replace the thermostat you'll find it's fixed and gauge will read in the middle again.
cheers
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