On the "Tech Forums" link on Pelican Parts, toward the bottom of the page is a classifed parts link for 914 stuff--Porsche 914 Used Parts For Sale & Wanted. I have had great luck posting a WTB (wanted to buy) item there.
PS Heres a pic of the famous angled speedometer cable gear. I just this weekend had to swap mine out from my 74 914...only to be suprised that the one bolt that holds the hole mess in had been stripped out from a previous grease monkey. Thank goodness for helicoil inserts.
Good Luck,