So I have been fighting no tach since using the Hyfire 6AL. After using two tach adapters, still no tach. I have decided to go back to an Ignitor 3 module in the HEI. I also found out the lock up converter isn't working, the whole point of the TH350C. Also my speedometer gears are way off, like 70 mph is 50 km/hr! It doesn't make sense. I may go back to where it was a 9 tooth drive and a 38 tooth driven but was 5 or 10 mph slow, I believe. Also sealing thermostat's on Olds V8's always seem to be a challenge, I got it sealed but need to redo it, pretty sure the Thermostat has RTV blocking it from opening. I feel like Clutch or Fleming442, nothing but good news. The paint only looks slightly better than before once in the sun.