What kind of duty cycle are you expecting to see? 30 seconds doesn't really sound abnormal to me. Most of the R134a systems will engage the clutch for 5-15 seconds (depending on heat load, humidity ect) and then disengage for about 15-40 seconds until the pressure in the accumulator drops back...
Started a new job about 6 weeks ago witch has put me in closer connection with all types of racers... stubborn, opinionated, outspoken racers. Anyway here is one debate that has been circulating through the shop lately and I was just curious how you guys feel about this.
Driver "A" states...
I've used this on several engines (392 but not tried 426) and it has worked well every time. Got it from OTC but it dose not have a brand stamp anywhere,
It might be worth a shot to try the truck dipstick and tube, #53021322AF . Not sure if it will hit somewhere but the bend and mounting points are different than what's pictured in OP.