has anyone experience with these things?
It's a digital RPM+shiftlight/air-fuel and autotimer meter...
http://www.globalsources.com/si/6008803327710/ProductDetail/Fuel-intake/product_id-1000463317/action-GetProduct.htm
Key Specifications/Special Features:
Air-fuel RPM torque (ART)
Digital air/fuel display
Air-fuel high-low set-up
Air-fuel warning inductor
Digital RPM shift
RPM with shift light
RPM peak hold and clean
Digital torque converter
Raise-up huge torque
Fuel saving
Stable electric equipment
Prevent air pollution
Air-flow RPM torque (VART) also available:
VART with all the ART functions, plus
Digital VTEC controller
VTEC low-high cam set-up
VTEC set-up area from 800rpm to 20,000rpm
VTEC on indicator