I have one of the aforementioned speedometer ratio adapters but I have no idea what ratios it changes. It is made by Stewart-Warner with the following numbers: 668F S12 1 2020 X. If anyone knows how to decode these numbers it may be usable to somebody.
I have no use for it so if someone is interested you can PM me.
Fred
Look for a decimal point. Have 2 in front of me, .7333 (1 : 0.733) & 1.2020 (1 :1.20).
I've us a GPS speedo app on my phone. Drive 50 mph by digital speedo app, indicated speedometer reading above or below GPS X 2 = % needed read correct.
