For a more comprehensive list of features, check out this page on the official ScanGauge II website:
http://www.scangauge.com/features/
GROUP BUY DETAILS/PRICING
MSRP --> $169.95
RPM's Retail Price --> $159.95
Qty: 1 to 9 --> $154.95
Qty: 10 to 19 --> $149.95
Qty: 20 to 34 --> $144.95
Qty: 35 or more --> $139.95
TOTAL GROUP BUY ORDERS SO FAR: 35+
Pricing includes shipping within the US. Residents of Hawaii and Alaska may use the shipping quote code: FREE. Shipping to Canada will be an additional US$7.00, so you may use the shipping quote code: 1117X
Given that ScanGauge II has been around a long time I would surmise that all of the development costs have been recovered and the margin is high. Perhaps EM can get a better price?