80's era accel piggyback tuners

[Bill Chase]

Saw an interesting thing on Ebay. Accel 74520 master tuner.

Ligenfelter mentions briefly piggyback tuners of the tpi era and shows a picture of an accel "master tuner"

I have googled and even searched the old geocities as well as Yahoo stuff and found nothing.

For 25 bucks I went ahead and bought it, but I can find no info, as we all know Holley has since acquired accel and the old stuff is long gone

Hoping someone can tell me what it is or lead me to some information about it accel master tuner with 74520 hand written in a blank part number box on the end of the retail package from accel.

[Orr89rocz]

Sorry dont have any info to add on that but might want to try asking around on thirdgen.org or the gearhead efi web forums. I tried a quick search on thirdgen but didnt find anything

Everyone now uses moates type chip adapters and tunerpro type software to tune tbi and tpi 80’s stuff. No need to piggyback you access everything through the chip