Optical bench mounting and thermal management techniques are disclosed that enable increased dimensional stability. A network is formed of wireless access points coupled via wired links and enabled to communicate with clients via radio channels of each of the APs. Service data is input into a portable handheld computing device and transferred from the portable handheld computing device to a vehicle onboard computer. 05 to 35 mol % of dipentaerythritol, the mixed carboxylic acid comprises 25 to 55 mol % of monocarboxylic acid having 5 to 8 carbon atoms and 45 to 75 mol % of isononanoic acid, and the composition has a hydroxyl value of 5. A first calculator obtains drive information indicative of an actual driving speed of the driving source based on the sensed position of the pump member.