I looked for a less expensive alternative, but to do it right, I got the Autometer gauge. Look for a used one, that's how I found mine. Don't skimp. You are putting serious money into your car, why get cheap when it comes to the gauge?
1990 LX Coupe 5.0 5 speed w/ 2000 Exploder GT-40 engine, P heads, mystery cam (F cam per previous owner) 3.73, and not much else. In the parts pile - UPR tubular K member, CC plates. Future plans - Megasquirt & On3 turbo system.