I have had these laying around for awhile now that at one point had a purpose, but now they do not. Better let them go to a good home before they get lost again! 90* adapter - $40 Gear reducer - I thought it was 0.5:1, but it's somewhere between 0.5 and 1.0... $20 Coupler: run two tachs or two speedometers off one input - $100 Guage pod for 2 1/16" gauges - $20