I have a chance to buy a used AVC dask kit with 160 MPH, 7000RPM Tach, Boost, water temp, oil, and fuel gauges. All are VDO. What is the history of this unit and who made it? I was considering buying a CAS dash by Tony DeQuick, but this is half the price. Is it a decent dash kit or should I go with the CAS unit. The seller is asking $400 for the AVC dash. Any comments would be appreciated. Thanks.