It analyzes multiple functions. Its a LCD display on the guage cluster which reads oil temp, water temp, outside temp, and some other things. Shannon "Better to burn out than to fade away" 87 16V w/210,000 mi. -- Email problems to: scirocco-l-probs@scirocco.org To unsubscibe send "unsubscribe scirocco-l" in the message to majordomo@scirocco.org