So I got 2 adapters DB25 (Connector DB24 D-Sub Male Plug 25-pin Port Terminal Breakout PCB Board & DB37 (sysly DB37 D-sub male female 37pin Terminal breakout PCB Board Screw Adapter (Male)) to plug into the two wiring harness plug connectors, from these I point to point wired to an Ultimarc A-PAC2 USB adapter (2 analog channels) and then used Universal Control Remapper (UCR) to gather all the inputs.
I replaced the CRT with a 32" 1080p LCD.
I'm running
Sega Model 2
SuperModel (R742)
DeMul (Crazy Taxi/Faster Than Speed/F355/Maximum Speed/Sega Nascar)
TeknoParrot (v182) (Battle Gear 4, Chase HQ2, Daytona 3, Ford Racing, Maximum Tune 5, Sega Racing Classic, Sega Rally 3)
All RH (Road Fighters 3D)
I've tinkered with Mame but honestly I don't feel like I'm missing much (California Speed, Rush the Rock)