[Ronbo]

I really wish they'd get some documentation on their site for this stuff...

The gauge site only has a couple install guides. I can pretty much figure out how to drill a hole. I also understand the gauges are Tom's project but there's no link to them on the Kirkham site that I saw.

JJ I don't think it matters, the speedo is counting pulses from the sender during that time frame so your telling it "OK, those many pulses was 2 miles" from that it figures out everything else... (Time being a constant for MPH calculation)

Gas gauge is also a variable with different sending units, so it would also require a cal. If your tanks not perfectly square this can be off some as well.