I picked up an AEM from Ebay for around $200 + s/h. Very quick and easy to install, $25 to have the bung welded in, then a hot and a neg, and plug in the sensor. I mounted my gauge under the dash w/ my temp and volt gauges. Just a quick glance now and then while cruising and I was able to jet my 5200 easily. I don't plan on keeping it in forever, going to let my buddy use it tune his '65 fastback 302. I might keep it if I ever get headers or sell it for a few $$