Progress. After realizing they flip-flopped 12 and 11 on that diagram...This is the circuit from the spec sheet that matches your setup. Additional signal conditioning as Ian0 suggested maybe required. The component values should be right on for 1.75 volts at 117hz.
View attachment 282700
That circuit works on my bench using tone generator and headphone cables
In the car it immediately blew the lm2917, checked the diode I'm using for clamping and it clamps at 32v while the input max is 28v, not sure if the 10k resistor on the input would've dropped the voltage enough.
I'll look into the clamping circuits provided above along with others
Thanks everyone.