I know what you mean. The thing I like about the injector is that it is a variable rate pump. It pumps oil at a different rate depending on the rpm's the engine is at. In the long run it saves you money in oil and fouled plugs. There is a test in the manual that gives you a good idea if it is pumping at the correct rate, but you need a high speed dremel to get the correct rpm's to test it. The pump to replace is kinda pricey at like $200.00 I think, if memory serves me right. If you go to premix it will always be at 50:1 at all rpm's, but it is peace of mind, on a 94 machine.
Karl