I've seen the Dakota Digital 5 unit and am talking with the tech there. It is unclear whether it will work with the two different R&P ratios.

I have even considered GPS units (Dakota Digital or Classic Instruments' "SkyDrive" SN81. I would feel more comfortable with something driven off the vehicle itself.

I am considering purchasing a ABS ring and sensor and machining one of the front hubs to accommodate it, but that seems like a lot of effort and who knows if the ring (1999 P30 Chevrolet) would fit even with machining?
A bit of a risky purchase.

...also, the project is in California