Gas mileage 225 Slant 6

Analogprincess said
I wish I could do that but none of my instruments work.

https://www.amazon.com/gp/product/B07NVN9QRB/?tag=fabo03-20

or for a less permanent solution, this one is awesome. Just be aware it (for some stupid reason) measures distance in kilometers but speed in miles, so you will need to convert):

https://www.amazon.com/gp/product/B0964QTJ9X/?tag=fabo03-20